15. Which of the following characteristics is not true to both DNA and RNA?

A. DNA is present only in the nucleus while RNA is present only in the cytoplasm.
B. DNA has deoxyribose-phosphate backbone while RNA has ribose-phosphate backbone.
C. DNA has thymine base while RNA has uracil base
D. DNA has two strands of nucleotides while RNA has one.

16. Which of the following bases in RNA pairs with adenine base in DNA during transcription?

A. adenine
B. cytosine
C. guanine
D. uracil

17. Which of the following bases is not found in RNA?
A adenine
B. cytosine
C. guanine
D. thymine

18. Which of the following brings in amino acids from the cytoplasm to the ribosome during protein synthesis?
A. Messenger RNA (mRNA)
B.Ribonucleic acid (RNA)
C. Ribosomal RNA (rRNA)
D. Transfer RNA (TRNA)

19. Which of the following triplet bases does not code for stop codon?
A. AUG
B. UAA
C.UAG
D. UGA

20. During transcription, which of the following is the correct mRNA sequence of the given DNA strand with these bases: TAGACCTGAACG?

A ATCTGGACTUGC
B. ATCUGCAGTTGC
C.AUCUGGACUUGC
D. AUGUGGUCUUGC

21. Which of these triplet bases signals the start of translation in protein synthesis?
A. AAA
B. AUG
C.GC
D. GUA

22. How many amino acids does a polypeptide chain have after the given DNA strand is transcribed and its complementary mRNA is translated? DNA strand: TACGCCAATCCGAAATCT
A.4
B.5
C.6
D.7

23. The process of making an exact copy of DNA involves unzipping or breaking of the double strands of nucleotides. Which of the following enzymes is responsible for this event?

A. DNA helicase
B. DNA ligase
C. DNA polymerase
D. RNA primase

24. If a molecule of DNA has 60 adenine and 75 guanine nucleotides, how many thymine and cytosine nucleotides do this DNA have?

A. 40 thymine and 75 cytosine nucleotides
B. 60 thymine and 75 cytosine nucleotides
C. 70 thymine and 60 cytosine nucleotides
D. 75 thymine and 80 cytosine nucleotides

25. If the DNA strand TAACCGCTA is replicated, which of the following is its complementary strand?

A. ATTGATCGA
B. ATTGGCGAT
C. ATTGTTGAT
D. GGCTATGGC

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