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kumpel [21]
3 years ago
14

Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for se

veral hours with nonradioactive leucine. Photographic emulsions are prepared at different times during the chase. Where would the black spots appear on an emulsion prepared 3 hours after the pulse?
Biology
1 answer:
stiv31 [10]3 years ago
3 0

Answer:

On the exterior of the cell.

Explanation:

The black spots as mentioned in the given case would appear on the exterior of the cell after three hours, which suggests that the proteins or the enzymes had been discharged from the pancreatic cell. The mentioned method of labeling and then chasing the component is known as a pulse-chase experiment.  

In this experiment, the labeled compounds are used to follow the dynamics of cellular pathways and procedures. The molecules in a cell get produced and degraded spontaneously at various rates. These changes in the localization of the molecule and its expression levels with time can be determined by exposing or pulsing cells to a labeled compound.  

After this the cells are exposed sequentially to the same compound unlabeled, the process is termed as the chase. The compounds are generally labeled with fluorescent dyes or radioisotopes.  

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Question 1 (2 points)
Blababa [14]

The amino acids coded triplets in the 3' to 5' strand on the normalp53 gene of chromosome 13 are lysine, leucine, Glutamine, stop codons.

Explanation:

mRNA is formed by the transcription of DNA strand coding for  a gene.

Any mutation in the DNA sequence even a difference of base pair would cause formation of different amino acids and hence altered protein.

The amino acid is formed in the step of translation where codes are read by tRNA on the mRNA strand and correct nucleotide is brought to growing polypeptide chain.

In transcription 3' to 5'  strand acts a template strand. The amino acids on the p53 gene of chromosome 17 is

3'TTT AAC   GTC    ATC 5'    Gene sequence

5' AAA UUG CAG   UAG 3'   mRNA

lysine, leucine, Glutamine, stop

8 0
3 years ago
Suppose that after 22 months, guppies from the transplanted population were returned to the source pool. What would most likely
hammer [34]
<span>When organisms are born in the wild, they tend to start developing an understanding of their surroundings based on their experiences. If an organism is transplanted to a different environment right after birth, it will develop the instincts to survive in that environment. A sudden change in its environment will result in the organism being out to place, possibly unable to cope with the selection pressures of its new environment. This will likely be the case with these guppies. This issue with transplantation is very real with animals born in captivity, which is why many are put through simulation exercises such as hunting and hearing the calls of predators, so that they may be able to survive in the wild, when transferred.</span>
8 0
3 years ago
How many atoms are in this picture?<br> Na3C6H507
olganol [36]

Answer:

Explanation:

Trisodium citrate has the chemical formula of Na3C6H5O7. It is sometimes referred to simply as "sodium citrate", though sodium citrate can refer to any of the three sodium salts of citric acid. It possesses a saline, mildly tart flavor. It is mildly basic and can be used along with citric acid to make biologically compatible buffers

Sodium citrate is chiefly used as a food additive, usually for flavor or as a preservative. Its E number is E331. Sodium citrate is employed as a flavoring agent in certain varieties of club soda. It is common as an ingredient in bratwurst, and is also used in commercial ready-to-drink beverages and drink mixes, contributing a tart flavor. It is found in gelatin mix[clarification needed], ice cream, yogurt, jams, sweets, milk powder, processed cheeses, carbonated beverages, and wine[citation needed], amongst others.

8 0
3 years ago
Todd's father slipped a disk in his back. Dr. Foster explained to the family that the intervertebral disks are composed of _____
vichka [17]

Answer:

D. Fibrocartilage

Explanation:

In order to understand the question, we need to review the structure of intervertebral discs.

Intervertebral discs consist of two parts:

  • <u>NUCLEUS PULPOSUS:</u>

It forms the central part of the intervertebral disc and consists of mucoid substance.

  • <u>ANNULUS FIBROSUS:</u>

It is composed of encircling layers of fibrocartilage and fibrous tissue surrounding the nucleus pulposus

<u>SLIPPED DISC:</u>

It is characterized by the protrusion of nucleus pulposus through the annulus fibrosus accompanied by the compression of spinal nerves.

Patient may present with loss of sensory sensations or pain or both.

<u>CORRECT ANSWER:</u>

From the above review, the correct answer is <u>D. fibrocartilage</u> as it forms the annulus fibrosus.

5 0
3 years ago
1. If the ability to taste PTC were controlled by only two alleles: one dominant (T) and one recessive (t), would there be any w
maw [93]

Answer:No

Explanation: there would not be a way to distinguish between Tt and TT without mating or DNA analysis because T is dominant in Tt, therefore has the same physical characteristics as TT.

8 0
3 years ago
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