Biology

Question 1

1DNA replication is described as semi-conservative because

Medium

A. both strands are new B. it keeps no original strands C. it happens only in half of all cells D. each new DNA molecule keeps one original strand

Question 2

2The process by which DNA makes an exact copy of itself is

Hard

A. transcription B. semi-conservative replication C. mutation D. translation

Question 3

3In DNA, adenine pairs with

Easy

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

Question 4

4The double-helix model of DNA was proposed in 1953 by

Easy

A. Pasteur and Koch B. Watson and Crick C. Hooke and Schleiden D. Mendel and Darwin

Question 5

5In RNA, the base that replaces thymine is

Easy

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

Question 6

6A DNA strand has the base sequence ATG CCA. The complementary mRNA is

Hard

A. UAG GCU B. TAC GGT C. ATG CCA D. UAC GGU

Question 7

7A group of three bases on mRNA that codes for one amino acid is a

Easy

A. codon B. gene C. chromosome D. nucleotide

Question 8

8The making of messenger RNA (mRNA) from a DNA template is

Easy

A. translation B. mutation C. replication D. transcription

Question 9

9If 30% of the bases in a DNA molecule are adenine, the percentage of guanine is

Hard

A. 30% B. 70% C. 20% D. 40%

Question 10

10RNA differs from DNA because RNA contains

Easy

A. no sugar B. thymine instead of uracil C. uracil instead of thymine D. two strands