Question

QUESTION 49

A type of mutation that does not alter the amino acid sequence of a polypeptide even though the nucleotide sequence has been changed.
      
Induced mutation
      
Nonsense mutation
      
Silent mutation
      
Missense mutation
      
None of the above
2 points   

QUESTION 50

Which of the following is an example of DNA damage?
      
Loss of the helix structure of the DNA.
      
A single break in the backbone of the DNA.
      
A thymine dimer.
      
All the above.
      
Only a and b
2 points   

QUESTION 51

A gene that has the potential to cause cancer and interferes with programmed cell death.
      
Metastatic tumor
      
Benign tumor
      
Malignant tumor
      
Oncogene
      
Pro-oncogene
2 points   

QUESTION 52

Among the viruses identified, the characteristics of their genome show many variations. Which of the following does NOT describe a typical characteristic of viral genomes?
      
The genetic material may be DNA or RNA.
      
The nucleic acid may be single-stranded or double-stranded.
      
The genome may carry just a few genes or several dozen.
      
The number of copies of the genome may vary.
      
All the able describe the variations found in viral genomes.
2 points

Answer 1

Answer 1. The type of mutation will be:-

C) Silent mutation (In this mutation, there is change of a single DNA nucleotide, but the amino acid so formed will not affect the sequence of the gene).

Answer 2. The example of DNA damage is:-

D) All of the above.(= loss of DNA helix structure due to any molecular changes or any environmental effects like radiations are considered as DNA damage. ; = single break in backbone of the DNA is the damage caused by ionizing radiation and UV-radiations. ; = the thymine dimer is also a damage caused due to any internal change or due to radiation effect).

Answer 3. A gene that has the potential to cause cancer:-

D) Oncogene (When these genes are mutated or are expressed at high levels, they tend to become cancerous).

Answer 5. Not a typical characteristic of viral genome is:-

E) All the able describe the variations found in viral genomes (3above mentioned all statements are the specific traits of viral genome. They can have either DNA or RNA as their genetic material, their nucleic acid may be single-stranded or double-stranded, they might have few genes or several dozen, and the number of copies of their genome can vary).