Question

In an interrupted mating experiment with the a⁺b⁺c⁺ donor, the a^-b^-c^- recipient becomes a⁺ after 10 min, b⁺ after 5 min, and c⁺ after 12 min. What is the order of the genes?

Group of answer choices

abc

bac

bca

Suppose you have discovered a new species on Mars whose genome consists of normal double-stranded DNA. After isolating the DNA, you find that adenine makes up 20% of the bases in its DNA. What is the percentage of guanine bases in its DNA?

Group of answer choices

10%

20%

30%

60%

One of the DNA strands in a double-stranded DNA molecule has the sequence 5’-ACCTGCTACGG-3’. What is the sequence of the complementary DNA strand?

Group of answer choices

5’-TGGACGATGCC-3’

3’-CCGTAGCAGGT-5’

5’-CCGTAGCAGGT-3’

3'-ACCTGCTACGG-5’

Answer 1

Q1.

Answer is

bac

Explanation. The gene which shows positive in the short time is the first one and the gene which shows positive in the last is the last gene.

Explanation for the wrong answers:

a can not be the first because it enters in 10 min that is after b (5 min).

c can not be second as it enters at 12 min that is after both b and a.

Q2.

In DNA Watson Crick base pairing is followed. In this, Adenine (A) will form two hydrogen bonds with Thiamine (T) and Guanine (G) will form three hydrogen bond with cytosine (C). Therefore, if 20% A is there then 20% T will be there and remaining 60% G+C. Therefore, amount of guanosine would be 30%.

Q3.

In DNA Watson Crick base pairing is followed. In this, Adenine (A) will form two hydrogen bonds with Thiamine (T) and Guanine (G) will form three hydrogen bond with cytosine (C).
Therefore the complementary DNA strand would have following sequence

3'-TGGACGATGCC-5'.