help 20-24 20. A naked virus has A No olothes B. No capsomere C. No spikes D. No
ID: 277416 • Letter: H
Question
help 20-24
20. A naked virus has A No olothes B. No capsomere C. No spikes D. No envelope 21. One of the following is true about HIV A It is a Retrovirus B. It is a RNA Virus C Its genome contains sequence for reverse transcriptase D. All of the above E. None of the above 22. All the following statements are true except A There are more tRNA molecules than there are codons B. There are more codons than amino acids C. There are more tRNA molecules than there are amino acids D. There are more codons than tRNA molecules 23. Amino acyl tRNA synthetase catalyzes the amino acid activation and uses A. Energy equivalent to 2 molecules of ATP B. Energy equivalent to 1 molecule of ATP C. Energy equivalent to 2 molecules of GTP D. It is an exergonic reaction 24. If the codon has 4 nucleotides instead of 3 nucleotides the number of possible codons would be A. 32 B. 64 C. 128 D. 256 25. The term -22 nt has significance in the description of A. tRNA B. rRNA C. mRNA D. miRNAExplanation / Answer
Hi Answer:
20. A naked virus has
Answer: Option D (No envelope)
Explanation: These naked viruses have no envelope which is made from glycoprotein or lipoproteins. The naked viruses are more resistant to the various agents. They enter into the host cell by receptor-mediated endocytosis, where cell surface receptor binds with viral nonglycosylated protein.
21. One of the following is true about HIV
Answer: Option D (All the above)
Explanation: The HIV is an RNA, retrovirus having reverse transcriptase sequence and causes AIDS.
22. All the following statements are true except
Answer: Option C (There are more tRNA molecules than there are amino acids)
23. An aminoacyl tRNA synthetase catalyzes the amino acid activation and uses
Answer: Option A (Energy equivalent to 2 molecules of ATP)
Explanation: An aminoacyl tRNA synthetase catalyzes the amino acid activation and uses 2 ATP molecules which are produced by the hydrolysis of two high energy phosphate bonds.
24.If the codon has 4 nucleotides instead of 3 nucleotides the number of possible codons would be
Answer: Option B (64)
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