1641. During DNA replication the 3-OH of the growing DNA chain attacks which phosphate of an incoming nucleotide?

A. Alpha
B. Beta *
C. Gamma
D. Delta

1642. Codons that code for the same amino acid are called :

A. Synonyms *
B. Similar
C. Degenerates
D. Complements

1643. Which of the following is not a characteristic of a tRNA molecule?

A. D arm
B. Beta arm *
C. T arm
D. Anti-codon arm

1644. What is a gene?

A. Sleep-inducing drug
B. Unit of heredity *
C. A kind of vitamin
D. A type of body cell

1645. Adenine and guanine are examples of what class of nitrogen base?

A. Large
B. Pyrimidine’s
C. Small
D. Purines *

1646. What is the rate of mammalian DNA replication?

A. 500 Nucleotides per second
B. 100 Nucleotides per second
C. 50 Nucleotides per second *
D. 10 Nucleotides per second

1647. What signals the end of transcription?

A. Stop codon
B. Terminator *
C. The end of the DNA chain
D. RNA polymerase runs out

1648. Which of the following is not a name for newly synthesized eukaryotic RNA?

A. Mature RNA *
B. Primary transcript RNA
C. Pre- mRNA
D. Transcript RNA

1649. How do the large and small subunits of a ribosome come together during translation?

A. Self-assembly *
B. With the aid of translation factors
C. By the hydrolysis of ATP
D. with the help of tRNAs

1650. Which of the following is not a component of a nucleotide?

A. Phosphate group
B. Anti-Codon *
C. Ribose Sugar
D. Nitrogen Base