Biology - Study Mode

[#936] What base does guanine pair with?
Correct Answer

(D) Cytosine

Explanation

Solution: Within the DNA molecule, guanine bases located on one strand form chemical bonds with cytosine bases on the opposite strand.

[#937] Which describes the correct pairing of DNA bases?
Correct Answer

(A) Guanine - cytosine

Explanation

Solution: Guanine - cytosine describes the correct pairing of DNA bases.

[#938] Sex determination of child is done by the chromosome of
Correct Answer

(A) Father

Explanation

Solution: The sex of the child depends on the male chromosome which is transferred to the offspring. This happens because males have a mismatched pair of chromosome XY which is responsible for deciding the sex of the child.

[#939] The principle of dominance states that
Correct Answer

(A) Some alleles are dominant, while others are recessive

Explanation

Solution: Mendel's law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively.

[#940] Nitrogenous bases in DNA and RNA?
Correct Answer

(D) All the above

Explanation

Solution: The five-carbon sugar ring and the content of the nitrogenous base between DNA and RNA are slightly different from each other. Four different types of nitrogenous bases are found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). In RNA, the thymine is replaced by uracil (U).