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3 years ago

What peptide would be made by translation from a synthetic mRNA made of the repeating dinucleotide CGCG…?

Biology

1 answer:

RSB [31]3 years ago

3 0

Answer:

The question lacks options, the options are:

A. a polymer of arginine plus a polymer of alanine

B. the peptide Met–Arg–Ala–Arg–Ala…

C. a polymer of alanine: Ala–Ala–Ala…

D. a peptide containing alternating arginines and alanines

E. a polymer of arginine: Arg–Arg–Arg…

The answer is D

Explanation:

Translation is the second process of protein synthesis (gene expression) where the mRNA molecule produced during transcription is used as a template for the synthesis of amino acid sequences, which species a particular polypeptide.

The nucleotides in the mRNA are read in a group of three in the ribosome. This triplet nucleotide is called CODON. Each codon specifies a particular amino acid and a collection of all codons constitutes the GENETIC CODE. Hence, in a case where dinucleotide CG is repeated in a sequence. The sequence will read:

CGC GCG CGC GCG CGC GCG..........

In the genetic code, codon CGC and GCG codes for arginine and alanine amino acids respectively. Therefore, if the CG dinucleotide keeps repeating, the nucleotides will be read three at a time, and the amino acid sequence will alternate between those two amino acids (Arginine and Alanine).

So we would have a peptide sequence looking like:

Arg-Ala-Arg-Ala-Arg-Ala-Arg...........

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What would you expect to be the final plant height for a plant grown in eight hours of light?

Nataly [62]

Answer:

Insufficient information to generate conclusion

Explanation:

It is really difficult to answer this question based on provided data. Rather speculations can be made. This is because of several reasons. The height of plant varies for different plant species. Likewise, it is really difficult for any plant species to the height of 5 inches (the lowest given option) within period of 8 hours only. It needs 8 hours light for several days to reach this much of height even for studied model plants such as arabidopsis. Thereon, each plant species would need different number of days.

On the other hand, it is important to consider that sunlight is a vital parameter for plant cells to elongate and multiply. This is because of the fact that plant use sunlight to fix carbon dioxide into the carbohydrates which is used in many cellular processes including cell division and growth. However, metabolic machinery in different plants works at different rates. Based on these reasons, it is super difficult to pick one option out of the given information to answer this question. Hope this helps.

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3 years ago

This is the first phase of cell division. In ________, the genetic material of the nucleus divides after making a copy of itself

d1i1m1o1n [39]

Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes which were duplicated during S phase condense and become thousands of times more compact than they were during interphase.

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3 years ago

In the experiment determining the parental genotype of plant seedlings from a monohybrid cross, if the dominant color was green

eimsori [14]

Answer:

cc × cc

Explanation:

This question involves a single gene coding for plant seedling. The green allele (C) is dominant over the white allele (c). This means that the green allele will mask the phenotypic expression of the white allele in a heterozygous state (Cc).

In this experiment where plate 1 only contained white seedlings instead of all green, this illustrates that all the offsprings were recessive. This is because the parental genotypes were both recessive for the color trait i.e. cc.

Note that, the recessive trait can only be expressed when the recessive alleles are present in a gene. Therefore, the parental genotype would have been cc × cc, in order to give rise to all offsprings with the recessive trait (white colour).

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2 years ago

All instructions for proteins, like hemoglobin, are stored in our _______, which is located in a cell’s ______________. This DNA

svlad2 [7]

Answer:

1. DNA

2. Nucleus

3. mRNA

4. Transcription

5. Nucleus

6. mRNA

7. Cytoplasm

8. Ribosome

9. Translation

10. anti-codons

11. codon

12. amino acids

13. protein

Explanation:

Deoxyribonucleic acid or DNA hold all the instructions that make up an organism. It determines the physical structure and even the function of the different cells that make up all organisms.

The DNA are all stored in the NUCLEUS of cells. Typically, eukaryotic cells have a nucleus except red blood cells. The nucleus has a nuclear envelope that keeps the DNA stored inside but it has nuclear pores that allows it to interact with the cytoplasm.

In order for DNA to be replicated, it needs to be turned into messenger RNA, otherwise known as mRNA. The mRNA decodes the DNA in order for the cell to use the code. The process is called transcription.

Transcription is done within the nucleus. Before the cell can understand what to do with DNA, mRNA transcribes to know what information it needs to produce specidic proteins.

Once transcription is done, it will then bring the information out of the nucleus and into the cytoplasm. The cytoplasm is the viscous gel-like solution that holds the organelles of the cell. In the cytoplasm you have ribsomes.

Ribosomes is where protein synthesis takes place, this is why it is called the protein factory of the cell. It is a molecule that is made up of ribosomal RNA, which direct the chemical processes involved in protein synthesis. For protein synthesis to happen, it will need another type of RNA, which is the tRNA.

tRNA is transfer RNA and they translate the mRNA sequence into proteins. tRNA have amino acids attached to it.

Each 3 bases of the mRNA are collectively known as codons. These codons correspond with specific tRNA that hold the anticodons. These anticodons code for specific amino acids that they also hold.

When they pair up, the tRNA drop off the amino acid which form a chain with the other tRNA amino acids that complete the code. These chain of monomers then make the protein specific to the DNA code that was copied in the beginning.

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tangare [24]

Maybe this is the answer

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1 year ago