your organism is catalase negative and produces a black precipiate on bile. what other test would likely be positive?
Answers
If your organism is catalase negative and produces a black precipitate on bile, it is likely that the organism would be positive for the oxidase test.
The oxidase test is used to determine if an organism produces cytochrome c oxidase, which is an enzyme involved in the electron transport chain in aerobic organisms.
The procedure of oxidase test includes:
1) Place a piece of filter paper in a clean petri dish and add 2 or 3 drops of freshly prepared oxidase reagent.
2) Using a piece of stick or glass rod (not an oxidized wire loop), remove a colony of the test organism and smear it on the filter paper.
3) Look for the development of a blue-purple colour within a few seconds.
The color change to dark blue or purple within few seconds indicates positive result. Colour signifies oxidase positive organisms which includes Pseudomonas aeruginosa.
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Related Questions
Single-cell organisms reproduce by splitting into two identical cells, a form of reproduction called
Answers
3. examine the graphic and description. propose a definition for ""endogamous lineage""?
Answers
Endogamous lineage refers to a social system in which individuals are only allowed to marry within their own kinship group.
The graphic and description suggest that endogamous lineage is a system in which individuals are encouraged to marry within their own community or family, in order to maintain cultural or religious traditions and prevent the dilution of certain genetic traits. This practice is common in many cultures around the world, particularly in societies where family and community ties are highly valued. Endogamous lineages can have both positive and negative effects, and can lead to both genetic diversity and inbreeding. Overall, the practice of endogamous lineage is a complex and culturally-specific phenomenon that requires careful analysis and understanding in order to be properly appreciated.
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Differences in traits can occur from both genetic and environmental factors.
True
False
Answers
True. Both genetic and environmental factors can contribute to differences in traits
the secondary immune response occurs when memory cells are activated by a second exposure to
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The secondary immune response occurs when memory cells are activated by a second exposure to the same antigen.
During the primary immune response, the immune system encounters an antigen for the first time. This leads to the activation of B cells and T cells, which then differentiate into effector cells that produce antibodies or carry out cell-mediated responses to eliminate the antigen. Some of these activated lymphocytes differentiate into memory cells.
When the same antigen is encountered again in the future, the memory cells specific to that antigen are quickly activated. The activation of memory cells triggers a more rapid and robust immune response compared to the primary response. This is known as the secondary immune response.
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What type of bonds are present in H2O2?
A.
covalent bonds
B.
nonmetallic bonds
C.
metallic bonds
D.
ionic bonds
Answers
Hope that helped
Think about the process of protein synthesis. Is it likely that errors can occur during the transcription and translation process? How do you think our cells “proofread” during this process to avoid errors? What do you think happens when errors occur?
PLEASE HELP YOU CAN EARN 50 POINTS
Answers
why does a person need protein in their diet?
Answers
Answer:
The body needs protein to build and repair tissues to make hormones, enzymes, body chemicals e.t.c.
The body also uses protein as a building block of blood , bones, skin , muscles, cartilage e.t.c.
Explanation:
prokaryote by an ancient eukaryote was the first step in the evolution of
Answers
The first step in the evolution of a prokaryote by an ancient eukaryote is known as endosymbiosis.
This process involves the engulfing of a prokaryote by a eukaryote, leading to the formation of an organelle within the eukaryote. This organelle is believed to have evolved into the mitochondria, which is responsible for producing energy for the cell.
Endosymbiosis is an important step in the evolution of eukaryotic cells, as it allowed for the development of complex cellular structures and functions. Without this process, eukaryotic cells would not have been able to evolve into the diverse and complex organisms that we see today.
In summary, the first step in the evolution of a prokaryote by an ancient eukaryote is endosymbiosis, which led to the formation of the mitochondria and the development of complex cellular structures and functions.
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Which are examples of structures composed of primary lymphoid tissue? Select all that apply.
bone marrow
tonsils
adenoids
thymus
lymph nodes
Answers
Answer: bone marrow and thymus
Explanation: its right.
Answer:
Yes, it is bone marrow and thymus. Got it right.
For this assignment, you will self-select a text and keep a reading journal. You will begin the process by describing the reason why you picked your selection. As you read the text, you will answer questions to make personal connections, connections to other texts, and connections to society. You also will keep a separate reading journal to record any other thoughts or feelings you have about the text as you explore your selection. Background Information When choosing a text, the first step is to consider your purpose for reading. In this case, your purpose is enjoyment. Second, look for a text on a topic that interests you. If you’re interested in nonfiction, choose a source that is credible and that offers evidence for the information it presents. If you’re interested in fiction, look for ideas and characters that are complex. Consider books that explore perspectives and cultures different from your own, and find a writing style you will enjoy reading. Choose a book that matches your reading ability and provides an appropriate challenge for you. When reading, it is important to make connections with a text. These connections include personal connections, connections to other texts, and how the text connects to society. You can use your background knowledge to make personal connections. Your background knowledge is what you already know about a topic and your experiences. Then, think of other texts you have read that have similarities in genre, character, structure, or topic. For connections to society, think about history and current issues or events that are explored in the text.
Answers
The aim of this exercise is to make an analysis of a text in order to see how deeply they connect to you and how enjoyable they are.
With this in mind, reading two or more texts and then making comparisons on their content and how they affect you is a good way to show things you enjoy or how much the words of the authors are effective.
What is a Journal?This refers to the individual pieces of writing that form your personal journal and records memorable events.
Hence, we can see that The aim of this exercise is to make an analysis of a text in order to see how deeply they connect to you and how enjoyable they are.
With this in mind, reading two or more texts and then making comparisons on their content and how they affect you is a good way to show things you enjoy or how much the words of the authors are effective.
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A strand of DNA consists of 35% adenine. What is the percentage of thymine in that same
molecule of DNA?
PLEASE HELP ITS A TEST
Answers
Answer:
Explanation:
The percentage of adenine will equal the percentage of thymine, and the percentage of cytosine will equal the percentage of guanine. Together, these percentages will add to 100%. We know that the sample is 35% adenine, which tells us that it is also 35% thymine.
Answer:
The percentage of thymine would also be 35%.
Explanation:
Hope this helps
Select the statements that accurately describe different ways that translocations could lead to cancer.
a. A translocation disrupts a gene that encodes a protein required to pass through mitotic checkpoints. The resulting protein cannot function normally.
b. A gene for a protein that regulates the cell cycle is placed next to the regulatory sequence of a different gene. The gene is now expressed at inappropriate times.
c. A translocation disrupts the sequence of a gene for a tumor-suppressor protein. The resulting protein cannot function properly.
d. A new sequence is added to a proto-oncogene. The modified gene now produces a new protein that increases the rate of cell division.
e. A gene for a tumor-suppressor protein is placed next to a regulatory sequence that increases the expression of the gene.
Answers
Option a, b, c and e are correct. Translocations can cause cancer by upregulating genes that drive cell division, disrupting genes that encode tumor-suppressor proteins, and disrupting genes.
The following claims appropriately sum up the various ways that translocations may cause cancer:
a. A translocation alters the expression of a gene that produces a protein needed to cross mitotic checkpoints.
b. A gene producing a protein that controls the cell cycle is positioned near to another gene's regulatory sequence. Now, the gene expresses itself at the wrong moments.
c. A translocation throws off the gene's sequence for a protein that suppresses the growth of tumors. The resulting protein is unable to perform as intended.
e. A regulatory sequence that boosts the expression of the gene is positioned close to a gene for a tumor-suppressor protein.
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Why does meiosis produce cells with fewer chromosomes?
Answers
Explanation: gametes have half the total number of chromosomes as somatic cells because when a sperm fertilizes an egg, their chromosomes will unite to make a full set. In the process of fertilization, the sperm fuses with the egg cell and they become one cell.
Across the seafloor, scientists find
A. flat, sediment covered bathymetry.
B. increasing crust thickness toward the mid-ocean ridges.
C. magnetic stripes with normal and reversed polarity.
D. none of the above
Answers
When population growth increases in an area, what is happening to the birth rate and age structure of that population?
a. increasing birth rate with a greater number of young organisms
b. increasing birth rate with a smaller number of old organisms
C. increasing birth rate with a smaller number of young organisms
d. increasing birth rate with a greater number of old organisms
Please select the best answer from the choices provided
A
OC
D
Save and Exit
Submit
Mark this and retun
Answers
Answer:
a
Explanation:
the increase in birth rate means more young organisms are born => greater number of young organisms
sam is infected by a rare mosquito transmitted disease that leads to degeneration of random endocrine glands. she is exhibiting dehydration symptoms although she is drinking the recommended amount of water per day. which of sam's endocrine glands is not functioning properly?
Answers
Sam is infected by a rare mosquito transmitted disease that leads to degeneration of random endocrine glands. She is exhibiting dehydration symptoms although she is drinking the recommended amount of water per day. Sam's thyroid glands is not functioning properly.
The thyroid gland, an essential hormone gland, is necessary for the body's growth, development, and metabolism.By continuously releasing a regular amount of thyroid hormones into the bloodstream, it aids in the regulation of numerous bodily processes.
The thyroid gland produces hormones that regulate the body's metabolic rate, affecting heart, muscle, digestion, and bone growth and maintenance. A sufficient intake of iodine from the diet is necessary for its proper operation.
A gland that produces hormones that are immediately released into the blood and travel to all of the body's tissues and organs. Endocrine glands control a variety of biological functions, such as growth and development, metabolism, and reproduction. The pituitary, thyroid, and adrenal glands are a few examples of endocrine glands.
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What are the raw materials needed for cellular respiration?
A. carbon dioxide and glucose
B. water and carbon dioxide
C. sugar (glucose) and oxygen
Answers
Answer:
C. sugar (glucose) and oxygen
Explanation:
The sugar (glucose) and oxygen are the main raw materials involved in the cellular respiration process.
Photoautotrophs are able to convert inorganic materials into glucose. In order to do this, they require:
Answers
Answer: sunlight, carbon dioxide, and water
Explanation:
This happens in photosynthesis
in total how many body systems work together to maintain homeostasis??
Answers
Answer:
2 (nervous and endocrine systems)
Explanation:
Answer: in total there are 11 systems that work together to maintain homostasis
Explanation:
A graph of atmospheric carbon dioxide concentration over time is shown. Scientists are investigating the cause of the large increase in atmospheric carbon dioxide concentration since about 1800. Which of the following provides the best explanation for the increase of carbon in our atmosphere?
A. Frequent eruptions of large volcanoes.
B. Naturally occurring fluctuations of in the carbon cycle.
C. Utilization of fossil fuels by humans for industrialization.
D. An increase in the sea level due to melting of ice.
Answers
Answer:
C. Utilization of fossil fuels by humans for industrialization.
Explanation:
Frequent eruptions of large volcanoes were happening long before humans and will happen after humans too. They are not the reason why we are seeing so much CO2 in the last 200 years.
There are some naturally occurring fluctuations of carbon but not to the degree that we are seeing.
Melting of ice and sea levels rising is due to the global warming problem caused by our dependency on fossil fuels.
The stories seem as tall as the lake is deep. For hundreds of years, visitors to Scotland's Loch Ness have described seeing a `monster. Some believe it lurks in the depths of the loch, or lake.
But now the legend of "Nessie" may have no place left to hide. A New Zealand scientist is leading an international team to the lake next month. They will take samples of the murky waters and conduct DNA tests to determine what species live there.
University of Otago professor Neil Gemmell says he's no believer in Nessie, but he wants to take people on an adventure and communicate some science along the way. Besides, he says, his kids think it's one of the coolest things he's ever done.
One of the more far-fetched theories is that Nessie is a long-necked plesiosaur. Plesiosaurs were long-necked marine animals that lived during the time of dinosaurs. The theory is that the reptile somehow survived the period when all dinosaurs became extinct. Another theory is that the monster is actually a sturgeon or giant catfish. Many believe the sightings are hoaxes or can be explained by floating logs or strong winds. Gemmell said that when creatures move about in the water, they leave behind tiny fragments of DNA. It comes from their skin, feathers, scales, and urine.
He said his team will take 300 samples of water from different points around the lake and at different depths. They will filter the organic material and extract the DNA, he said, sequencing it by using technology originally created for the human genome project.
He said the DNA results will then be compared against a database of known species. He said they should have answers by the end of the year."I'm going into this thinking it's unlikely there is a monster, but I want to test that hypothesis," Gemmell said. "What we'll get is a really nice survey of the biodiversity of Loch Ness."
He said the real discoveries may come in determining things like the prevalence of invasive species.
"I hope he and his cohorts find something, although I think they'll be battling," Matheson said. "Still, it's a good way to get a trip to Scotland," Gemmell said that even if they don't find any monster DNA, it won't deter some Nessie believers. He said they've already been offering him theories, like how Nessie might be on vacation after swimming to the sea via hidden underwater caves. Another is that the creature might be extraterrestrial and not leave behind any DNA.
"In our lives, we want there still to be mysteries, some of which we will ultimately solve," Gemmell said. "That's part of the spirit of discovery. And sometimes, what you find may not be what you were expecting."
Who - New Zealand scientist
What - taking water samples
When - next month
Where - Scotland
Why - determined if the loch ness monster is real
How - testing DNA samples
Use 5 Ws and H to write a summary of the article above, including a main idea (first sentence) and at least 3 supporting details.
Answers
Neil Gemmell, a lecturer at the University of Otago, said he doesn't believe in Nessie, but he still desires to take tourists on an experience and interact with them.
Describe an adventure?A book detailing his numerous daring expeditions. the experience of risks the spirit of exploration. : a memorable or interesting experience. It could also be a daring, typically dangerous activity with a hazard of failure. Adventures might include physically risky activities like exploring, skydiving, mountain biking, river rafting, or engaging in extreme sports.
Describe a book?A collection of printed, blank, or written sheets bundled within a front and rear cover. a large printed or written literary work.: an address book Pages are the pieces of paper that make up a book. The pages contain
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the main purpose of mohorovičićs investigatton of seismograms was to?
Answers
The main goal of Mohoroviis' seismogram investigation was to understand the structure of the earth's interior, as the earth has different layers with different properties.
What is the Mohoroviis seismogram investigation?Mohorovii, a Croatian geophysicist, made significant contributions to the understanding of the Earth's interior structure by analyzing seismograms from earthquakes, and his work helped to reveal the existence of the Earth's crust and mantle, as well as the boundary between them, which is now known as the Mohorovii discontinuity.
Hence, the main goal of Mohoroviis' seismogram investigation was to understand the structure of the earth's interior, as the earth has different layers with different properties.
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Why are seeds an evolutionary advantage for seed plants?.
Answers
The seed offers the embryo protection, nourishment, and a mechanism to maintain dormancy for tens or even thousands of years, ensuring germination can occur when growth conditions are optimal. Seeds therefore allow plants to disperse the next generation through both space and time.
a strand of dna that will pair with AATTCGTAATTGGCTAG
Answers
Answer:
lol what?
Explanation:
A base pair is two chemical bases bonded to one another forming a "rung of the DNA ladder." The DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
Answer:
TTAAGCATTAACCGATC
Explanation:
Thymine (T) pairs with Adenine (A)
Cytosine (C) pairs with Guanine (G)
blank blood cells are also produced that are important for the body's blank system
Answers
Answer:
White
Immune
Explanation:
White blood cells, also called leukocytes, are one of the cells that are involved in the body's immune system. They protect the body against various infections diseases and other invaders. Leukocytes are produced in the bone marrow (hematopoietic stem cells). They are not the only cells that are important for the defense of the body but are important.
Your friend tells you that she saw a bright object with a
tail that lasted a few moments in the night sky. She thinks it
might have been a comet. Is she correct? Why or why not?
If not, what did she likely see? Write your answer below in
complete sentences.
Please Hurry!!! Thank you
Answers
probably not, it misht be a satelite, and it burns when it enter in our atmosphere
Answer:
no it was most likely a meteor because meteors burn quick in the atmosphere
Explanation:
only answer no explanation to save time. 1 to 5
Answers
Step 1. mRNA is transcribed in the nucleus, exits to the cytosol through, and binds to a ribosome.
Step 2. Protein synthesis occurs at the rough endoplasmic reticulum.
Step 3. The protein travels by vesicle from one organelle to another inside the cell.
Step 4. The Golgi apparatus processes, sorts, and tags the protein for delivery to its final destination.
Step 5. Exocytosis.
Positive transcription factor (PTR) is important because it turns genes on to prepare them to be read. What is more important (i.e., which has a greater impact if it is changed): concentration or affinity? If PTR concentration is low but affinity is high, then what will happen to protein levels versus if PTR affinity is high but concentration is low? Argue your point in three to five sentences. Use the simulation if necessary.
Please Help! (30 pts)
Answers
Answer:
Transcription factors are vital molecules in the control of gene expression, directly controlling when, where and the degree to which genes are expressed. They bind to specific sequences of DNA and control the transcription of DNA into mRNA. Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell.
Explanation:
Hope This Helps :)
If PTR concentration is low but affinity is high, then low protein levels will be enough to promote transcription. If PTR concentration is high but affinity is low, then high protein levels will be needed to promote transcription.
A transcription factor is a protein that binds to a specific DNA sequence in order to promote or inhibit transcription. Transcription factor occupancy refers to the efficiency that exhibits a factor to promote or suppress transcription.This measurement (occupancy) depends on both the affinity of a particular transcription factor by a specific nucleotide (DNA) sequence and its concentration.In conclusion, if PTR concentration is low but affinity is high, then low protein levels will be enough to promote transcription. If PTR concentration is high but affinity is low, then high protein levels will be needed to promote transcription.
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This figure summarizes the geological histories of the terrestrial worlds. Based on this figure, what can you conclude?
Answers
Based on this figure the most important factor in a planet's geological history is its size.
Terrestrial planets include Mercury, Venus, Earth, and Mars because of their compact, rocky surfaces that resemble terra firma on Earth. The four innermost planets in the solar system are the four terrestrial planets.
Impact cratering, volcanism, tectonic movement, and erosion are the four main geological processes. Earth has been hit by many objects, but the majority of the craters have been removed by other processes. Volcanic outgassing is responsible for the formation of our atmosphere and oceans.
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what type of molecule carries genetic information?
Answers
Answer:
Deoxyribonucleic Acid (DNA)
Explanation:
DNA is the chemical name for the molecule that carries genetic instructions in all living things.