Citrulline have to be supplied to the mutants of Neurospora that identified three classes of mutants that needed arginine added to minimal media that had a defective enzyme in order to grow.
The amino acid arginine is synthesized by first converting a precursor to ornithine, that is then transformed to citrulline, which is then converted to arginine. Every one of these three steps is controlled by a different enzyme, which is encoded by a different gene.
The synthetic pathway is undamaged in wild type Neurospora, and spores can thrive on minimal medium even without addition of amino acids. Some enzymes in the pathway are non-functional in mutant Neurospora, preventing spores from growing on minimal medium. All of the mutants in this section are referred to as arg- mutants because they all grow when the minimal medium is supplemented with arginine.
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An acid-fast staining method was performed on a bacterial smear using the dyes carbol fuchsin and methylene blue. The resulting stained slide contained only cells that appeared blue when visualized using a microscope. Which of the following could explain why only blue cells were present?
a. No acid-fast bacteria are present on the slide
b. Methylene blue was not used
c. Carbolfuchsin was not used
d. Acid-alcohol was not used
Answer: Only blue cells where present because No acid-fast bacteria are present on the slide. The correct option is A.
Explanation:
Acid fast staining method also called Ziehl-Neelsen (Zn) technique is used in the laboratory to stain samples suspected to contain Mycobacterium species. The Mycobacterium species which includes the M. tuberculosis, M. ulcerans, and M. leprae, do not stain well by the Gram technique, which is a common routine stain in the laboratory. This is because of waxy coating on its cell surface primarily due to the presence of mycolic acid.
The acid fast stain consists of:
--> A primary dye which is the carbol
fuchsin
--> A decolorizer which is the acid alcohol
--> A counter stain which is the methylene blue.
In it mechanism of action on the bacterial smear, when the primary dye is applied,the whole cell will appear red. But after decolorizing with acid alcohol, only acid fast bacteria will retain the red colour of carbol
fuchsin while the red dye from the background cells are removed. Then the counterstain (methylene blue) is applied which is picked up by non-acid-fast bacteria making the cells appear blue under the microscope.
Therefore when the bacteria smear is viewed under the microscope and only blue cells are seen, it means No acid-fast bacteria are present on the slide.
help, please........
Answer:
i dont know sorry
Explanation:
Explain how prokaryotes (note that this is for prokaryotes and NOT eukaryotes) control gene expression.
Answer:
By Controlling transcription
Explanation:
Prokaryotic cells regulate their gene expression by controlling the amount of transcription. This is the only way of regulating the gene expression.
Unlike the prokaryotic cell, in eukaryotic cell, different compartments were formed for carrying out different cellular processes. Later on, transcription and translation were physically separated and were carried out in two different cellular compartments
What season is it in Buenos Aires when it is winter in Boston, Massachusetts? Winter Summer Spring Autumn
Answer:
Spring is ur answer
Explanation:
Answer:
summer :)
Explanation:
Which component of biodiversity takes into account the number of different habitats and niches present in an ecosystem?
Select one:
A. Genetic
B. Stabilizing
C. Ecosystem
D. Species
Answer:
D is the answer hope it helps
Which characteristic is representative of an advanced animal?
A body symmetry that is asymmetrical
B body symmetry that is radial
C body symmetry that is bilateral
D one germ layer
Answer:
your answer would be c
Explanation:
any advanced animals will be bilateral, for example: all insects and mammals ad birds are bilateral, so even if the organism was any of the three, it would be bilateral
how many total autosomes do human cells have
Answer:
22
Explanation:
....hope it helps.......
Answer:
Humans have 22 pairs of autosomes ..
Explanation:
answer the question below
Answer:
the answer I would say would be C
Napollion Crossing The Alps
Answer:
Napoleon Crossing the Alps (also known as Napoleon at the Saint-Bernard Pass or Bonaparte Crossing the Alps; listed as Le Premier Consul franchissant les Alpes au col du Grand Saint-Bernard) is a series of five oil on canvas equestrian portraits of Napoleon Bonaparte painted by the French artist Jacques-Louis David ...
Explanation:
please give me brainlist and follow
How does parental investment help reproductive success
Answer:
Explanation: investment in offspring by the parent that increases the offspring's chances of surviving and hence reproductive success at the expense of the parent's ability to invest in other offspring.
The DNA determines the RNA, and the RNA determines the protein, and the protein
determines the ?
Answer: Section 4.4The Three Roles of RNA in Protein Synthesis. Although DNA stores the information for protein synthesis and RNA carries out the instructions encoded in DNA, most biological activities are carried out by proteins. brainliest?
Explanation:
There are more than 300,000 species of plants that have been identified thus far in the world today; many new species are being discovered each year. In addition to providing most of the oxygen for land animals, plants do many other things for us. you will research the Internet and use reliable and credible scientific websites to investigate a specific plant species and choose a way (other than providing oxygen) that plants are useful to humans. [NOTE: Hot topic plants like Marijuana and Opium are off limits and cannot be discussed.]
Writing a full paragraph (a 150-words minimum) for your initial blog post discussing a specific species of plant and the benefit you chose. Be sure to describe what type of plant it is. Where is it found? How does it impact humans or other species? What role does it play in the ecosystem, etc.?
Answer and Explanation:
We can mention the advantages of the plants of the Fabaceae family, also known as legumes, such as beans, soybeans, peanuts and peas. First, we must mention how these plants have high nutritional values providing high levels of iron and nitrogen that are essential elements for human health. However, a benefit that these planats produce and that is important on a worldwide scale is the fixation of nitrogen in the soil. All living beings need nitrogen in their bodies, since nitrogen is a primary element in the composition of nucleic acids and proteins. Animals are able to ingest nitrogen from the vegetable diet, but vegetables cannot absorb nitrogen from the atmosphere or nitrogen from the soil, because they are not in molecular forms that plants can absorb. To reverse this, farmers put chemical fertilizers on the plantations, but these fertilizers pollute the environment intensely. It is in this scenario that the plants of the Fabaceae family are important. This is because these plants are able to associate with bacteria that can capture atmospheric nitrogen and place it in the soil, in the molecular form that all plants can absorb. This allows plants to have the necessary nutrients for their growth, reduces environmental pollution, decreases spending on agricultural production, promotes correct levels of nitrogen for human consumption and allows agricultural products to be healthier.
Lakesha was culturing bacteria. She used aseptic technique to make sure there was no contamination. When she was finished, she used water to clean the surface of her table. She then put the sample in the incubator, removed her gloves, and washed her hands with soap and water.
Answer:
d. She should be using a disinfectant on her table, not just water.
Explanation:
When Lakesha finished culturing the bacteria, she should not have used water alone to clean the table because water can't kill bacteria. She has to use a disinfectant in order to remove bacteria from the table. This disinfectant has the ability to kill all the bacteria that is present at the table and there is no chance of infection from these bacteria. So we can say that she made a mistake to clean the table with just water and not using the disinfectant over it.
WILL GIVE BRAINIST
Question 1 Only
Years after the lava from an erupting volcano destroyed an area, lichens started to grow in that area. These were gradually replaced by grasses, shrubs, conifers, and finally by a deciduous forest. In this sequence of events, the lichens functioned as What?
(Answer if you know.)
A. primary consumers
B. abiotic factors
C. pioneer organisms
D. climax organisms
Answer:
I'm pretty sure it's c
Explanation:
I'm 80% sure its c I learned this last month
In this sequence of events (ecological succession), the lichens functioned as a class of pioneer organisms (Option C).
What is ecological succession?Ecological succession refers to the progressive emergence of different organisms and/or species in an ecosystem.
The ecological succession occurs after a period of ecological disturbance in the ecosystem.The ecological succession is fundamental for recovering the homeostasis of the ecosystem.In conclusion, in this sequence of events (ecological succession), the lichens functioned as a class of pioneer organisms.
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7 reasons plants are important to the environment
Answer: The House of the Scorpion
Explanation: the first sentence fight for this
Which structure is represents a ribosome
Answer: I'm not sure what the question is, given there aren't any images provided to choose from, but a ribosome looks something like the picture I attached. Good luck!
Explanation:
Which of the following describes a scientific law?
A. People have the right to a speedy trial.
B. Any two objects in the universe attract each other with a force called gravity.
C. The universe may have begun from an explosion (or big bang) from a single point.
D. Students must wear their safety goggles in the lab.
Answer:
B. Any two objects in the universe attract each other with a force called gravity.
Explanation:
Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.
Hence, the statement which best describes a scientific law is, any two objects in the universe attract each other with a force called gravity.
Gravity is considered to be a universal force of attraction which acts between all objects that has both mass, energy and occupy space. Therefore, it acts in such a way as to bring objects together.
Additionally, the gravity of earth makes it possible for all physical objects to possess weight.
A desert has a lower species richness than a tropical rainforest.
O True
O False
Answer:
True
Explanation:
C cytosine need help with this problem
cytosine
Answer:
Explanation:
Why do vestigial structures support evolution?
Answer:
Vestigial structures
Explanation:
support evolution, by suggesting us that the organism changed from using structure to not using structure or using it for another purpose.
4.5.1 Practice: Evolution and Classification
Answer:
?
Explanation:
Answer:
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Delte spaces
2. Name one positive benefit of having vertebrae for Chordates
What is the function of the large intestine?
A. Add bile to the food to help break it down.
B. Remove nutrients from the food with chemical processes
C. Absorb remaining material into the body
D. Remove water from the remaining undigested material
Answer:
C
Explanation:
The primary function of the large intestine is the Reabsorption of water and mineral ions such as sodium and chloride.
plssssss Help No Links
Answer:
Up
Explanation:
The force is the biggest (8N) so that's why it will move up
An energy pyramid is shown below. What does the energy pyramid demonstrate? A. The same amount of energy is available at every level of the energy pyramid. B. Energy is not transferred between organisms in an ecosystem. C. A great amount of energy is gained moving up the energy pyramid. D. A great amount of energy is lost traveling up the energy pyramid.
Answer:
A great amount of energy is lost traveling up the energy pyramid.
What type of plate boundary iS shown in the diagram?
O A. Subduction boundary
O B. Convergent boundary
• C. Divergent boundary
O D. Transform boundary
Answer:
I believe it is C. Divergent boundary
Answer:
C
Explanation:
which of the following is not a threat to biodiversity?
1. pollution and contamination
2. over hunting and over fishing
3. conservation and preservation
4. habitat loss and destruction
Food is useful to organisms because it contains ? Radiant energy, thermal energy, motion energy, chemical energy
Answer:
I think it's chemical energy.
What cell parts are common to all of these cells?
Use complete sentences.
Chlamydomonas
Spirogyra
Elodea
Squamous Epithelium
Answer: All cells share four common components: (1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; (2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; (3) DNA, the genetic material of the cell; and (4). The cells of most Chlamydomonas species are more or less oval and feature a noncellulosic membrane (theca), a stigma (eyespot), and a usually cup-shaped chloroplast. Although photosynthesis occurs, nutrients also may be absorbed through the cell surface. Asexual reproduction is by zoospores. The filamentous masses come to the surface and become visible as slimy green mats. Spirogyra has a cell wall, nucleus, pyrenoid and spiral chloroplasts. This Elodea leaf cell exemplifies a typical plant cell. It has a nucleus, and a stiff cell wall which gives the cell its box-like shape. The numerous green chloroplasts allow the cell to make its own food (by photosynthesis). The central vacuole takes up most of the volume of the cell. Squamous cells tend to have horizontally flattened, nearly oval-shaped nuclei because of the thin, flattened form of the cell. Squamous epithelium is found lining surfaces such as skin or alveoli in the lung, enabling simple passive diffusion as also found in the alveolar epithelium in the lungs. brainliest?
Explanation:
if the polar bear requires 5,600,000 kcal of energy each year how much energy do the seals that it eats require each year HELP ME PLEASE it is science.
Answer:
is it multiple choice?
Explanation: