GCD 3022 practice questions and answer the following quiz (9-13)

GCD 3022 practice questions and
answer the following quiz (9-13)

\. Which of the following are the four criteria the genetic material must fulfill? - AqeNSWER-A) DNA
repair, replication, transmission, variation

B) Store information, DNA repair, transmission, variation

C) Store information, replication, composed of DNA, variation

D)*** Store information, transmission, replication, variation



\.Which of the following could be the components of a single nucleotide found in DNA? - ANSWER-A)
*** Deoxyribose, phosphate, and thymine

B) Deoxyribose, adenine, and thymine

C) Ribose, phosphate, and cytosine

D) Ribose, phosphate, and uracil



\.Which of the following could be the components of a single nucleotide found in RNA? - ANSWER-A)
Ribose, adenine, and thymine

B) Deoxyribose, phosphate, and thymine

C) Deoxyribose, phosphate, and uracil

D)*** Ribose, phosphate, and uracil



\.When going from simple to complex, what is the hierarchy for the genetic material? - ANSWER-A)***
Nucleotide, single strand, double helix, chromosome

B) Single strand, double helix, nucleotide, chromosome

C) Nucleotide, double helix, single strand, chromosome

D) Single strand, double helix, chromosome, nucleotide

,\.In a DNA strand, a phosphate connects a 3'-carbon atom in one nucleotide to - ANSWER-A)*** a 5'
carbon in an adjacent nucleotide

B) a 2' carbon in an adjacent nucleotide.

C) a base in an adjacent nucleotide.

D) a 3' carbon in an adjacent nucleotide.



\.Which of the following is NOT a feature of the DNA double helix? - ANSWER-A) The DNA strands are
antiparallel.

B)*** There are 12 nucleotides in each strand per complete 360 degree turn of the helix

C) The structure is stabilized by base stacking.

D) It obeys the AT/GC rule.



\.A DNA strand is 5'-CGATT-3'. The complementary strand would be - ANSWER-A)*** 3'-GCTAA-5'

B) 5'-CGATT-3'

C) 5'-GCTAA-3'

D) 3'-CGATT-5'



\.In a double helix, the base pairing rules are - ANSWER-A)*** A to T, and G to C.

B) A to G, and T to C.

C) A to A, G to G, T to T, and C to C.

D) A to C, and T to G.



\.The structure of an RNA is much like that of a DNA strand. Strands of RNA are usually a few hundred to
several thousand nucleotides in length, - ANSWER-A)*** much shorter than chromosomal DNA, which is
typically millions of base pairs long.

B) can be longer or shorter than chromosomal DNA.

C) longer than chromosomal DNA, which is typically one hundred of base pairs long.

D) about the same size as chromosomal DNA.

, \.RNA is typically a ( )-stranded molecule, but base-paring within one RNA molecule may cause a short
segment of RNA to form a ( ) structure. - ANSWER-A) double, helical

B) helical, double

C)*** single, helical

D) helical, single



\.The total amount of G plus C in an organism's DNA is 46% of the total base content of that DNA. What
are the percentage of A, T, G, and C in the DNA? - ANSWER-A) A (18%), T (18%), G (32%) , C (32%).

B) A (23%), T (23%), G (27%) , C (27%).

C) A (27%), T (23%), G (27%) , C (23%).

D)*** A (27%), T (27%), G (23%) , C (23%).



\.Which of the following DNA double helices would be more difficult to separate into single-stranded
molecules by treatment with heat, which breaks hydrogen bonds? - ANSWER-A) 5'-CCAATACCAGCCCA-3'

3'-GGTTATGGTCGGGT-5'

B) 5'-AAAATTTTCCGGAT-3'

3'-TTTTAAAAGGCCTA-5'

C) 5'-AAAATTTTAAGGAT-3'

3'-TTTTAAAATTCCTA-5'

D)*** 5'-CCCCTACCAGCCCA-3'

3'-GGGGATGGTCGGGT-5'



\.A double-stranded DNA molecule contains 720 nucleotides. How many complete turns occur in this
double helix? - ANSWER-A)*** 36

B) 60

C) 30

D) 72



\.The base composition of a DNA virus was analyzed and found to be 15% A, 35% T, 15% G, and 35% C.
Which of the following statements best describes the genetic material of this virus? - ANSWER-A) It is
mostly likely a double-stranded DNA, because the amount of G equals that of C.