Question

Question 3

You've identified a gene likely involved in a human disease. You BLAST the predicted protein sequence for the gene against the database of known protein sequences and see that a domain of your unknown protein is similar to the nuclease domain of a RISC complex protein. Therefore... 

Select one: 

a. The unknown gene is likely to be a microRNA gene 

b. The unknown protein is likely to be a nuclease that cuts RNA 

c. The unknown protein is likely to be a nuclease that cuts DNA 

d. The unknown protein is likely to be a restriction endonuclease 

e. The unknown protein is likely a component of the RISC complex

Question 4 

Which of the following statements is not TRUE with respect to the structure of DNA? 

Select one: 

a. The two strands that form DNA are complementary and antiparallel to each other 

b. All options are true with respect to the structure of DNA 

c. The backbone of DNA is formed by phosphodiester links that binds the 5' end of one nucleotide to the 3' of the next one. 

d. The alpha helix is the consequence of hydrogen bonds in between the oxygen of one nucleotide and the amine group of a different nucleotide 

e. The DNA double helix has a constant diameter because each pyrimidine binds complementary to a purine

Answer 1

3. Answer: Option B is correct
Explanation:
The RISC complex is involved in the post-transcriptional cleavage of target transcripts.
It contains several enzymes with ribonuclease activity.
If a protein with a nuclease domain similar to the RISC component is found, it is most likely to be an RNase. It may or may not be a RISC component

4. Answer: Option D is correct
Explanation:
Alpha-helix is a type of secondary structure found in proteins.
It is not found in DNA.