Molecular Biology Answers

2. All cells of a sick man have 47 chromosomes due to the extra X - chromosome. Indicate the name of this mutation, all possible mechanisms of its occurrence and the likelihood of its transmission to offspring.

1. A blue-eyed boy was born in a family where both parents are brown-eyed. What kind of variability manifested itself in this case? Explain all the possible mechanisms of such variability.

Task 1. Genes that were to be expressed in the S period remained inactive. Will this affect the course of mitosis? Name the genes controlling the S period. Explain their mechanisms.

Task 2. The protein contains the amino acid valine. As a result of mutations in the DNA molecule, the replacement occurred in one nucleotide. The triplet encoding the amino acid - cysteine encoded by the UGU triplet is replaced by the UGA triplet. This replacement results in ______________ mutations.

Task 1. When nitrous acid acts on DNA molecules, cytosine is replaced by guanine. Determine the type of mutation. Explain the mechanism. What structure will a section of the synthesized protein have if a polypeptide with the following amino acid sequence was to be formed: ser - ile - tre - proser, but all cytosine nucleotides of the corresponding DNA region underwent the specified chemical transformation? Determine the type of mutation.

Exercise 1. Fill in the table:

Types of apoptosis

Types of apoptosis

Characteristics

"Apoptosis from the inside"

"Apoptosis on command"

Evaluate the effectiveness of screening the blood products for one transmissible disease by considering the safety of the products used in blood transfusions and the screening procedures used.

• consider the safety of the products used in blood transfusions by discussing, in general terms, the screening procedures used.

• evaluate the effectiveness of the screening process in relation to one named transmissible disease.

Which ions are being produced by this process, assuming that each of the chemical compounds dissociate into their constituent parts once they are dissolved in water?     

Choose the right answer:

1-there is editing in rRNA also

2-editing occurs by Intron splicing

3-editing means the correctians of the mistakes in mRNA sequence

4-maturation of mRNA occurs in the cytoplasm

5-information content of RNA Can be changed by editing

short notes on these topics about 1 1/2 pages

a) Nuclear export of mRNA

b) mRNA stability

c) Inhibitors of transcription and their mode of action

d) Inhibitors of translation and their mode of action