Question

Warm Up Questions (6 pts.)

a.) Transcription occurs along a ____ template forming an mRNA in the ____ direction. (0.5 pts.)

A) 5' to 3'; 5' to 3'

B) 5' to 3'; 3' to 5'

C) 3' to 5'; 5' to 3'

D) 3' to 5'; 3' to 5'

b. A DNA molecule has 180 base pairs and is 30% adenine. How many cytosine nucleotides are present in this molecule of DNA? (1 pt.)

c. Label all of the enzymes in the diagram below. Also, be sure to label the leading and lagging strands and the Okazaki fragments. (2 pts.)

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d. How many different combinations are possible for a 20 bp DNA primer? (1 pt.)

e. A genetic analysis of an unknown infectious agent reveals that it contains only the nucleotides G, A, U, and C in the proportion 30 percent, 35 percent, 15 percent, and 20 percent, respectively. Based on this information, this infectious agent has what kind of genome? (1 pt.)

dsDNA ssDNA dsRNA ssRNA DNA/RNA hybrid

f. In eukaryotes, there are _______________ codons that specify amino acids. (0.5 pt.)

a. 21 b. 24 c. 61 d. 64 e. 60

Answer 1

Answer for question a : The correct option is C (Transcription occurs along a 3' to 5' template forming an mRNA in the 5' to 3' direction)

Explanation : Transcription or the process of RNA synthesis involves the use of information present into DNA (template) is catalyzed by RNA polymerase in a process called DNA dependent RNA synthesis. The template strand is copied in the 3’ to 5’ direction (antiparallel to the new RNA strand) and synthesizes occurs in the in 5' to 3' direction.

​​​​​​​Answer for question B : Given % adenine = 30. It is known that for a double stranded DNA No. of Adenine = No of. Thymine and No. of Guanine = No. cytosine

Based on these observations,

Adenine = 30%,  Thymine = 30%

Guanine= 20%; Cytosine=20%