Molecular Biology Answers

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

While investigating different cells under electron microscope one could determine that some of the cells contain single microvilli on their surface, other cells contain brush border. What function do the cells of each type perform?

1. On the free surface of cells there are some structural components each of which contains nine pairs of peripheral and two pairs of central microtubules. What do we call; those structural components? What function do they perform?

Tables

Write down in a notebook the requirements for a histological specimens

It is necessary to compile the table about basic stages of preparation of histological specimens

Stages of preparation of the histological specimens The essence of the stage (describe)

2. During the surgical operation, it became necessary for the histological analysis of the operated organ. What methods of histological examination should be used in this case?