HSC Biology Multiple-Choice Quiz

Question 1

Two unaffected parents are heterozygous for the same autosomal recessive condition. What is the chance that their child inherits both recessive alleles?

Accepted Answer

25%

Question 2

Which change makes a protein's amino acid sequence different by substituting one amino acid for another?

Accepted Answer

A missense mutation

Question 3

Which observation best supports the claim that a bacterial population evolved resistance to an antibiotic?

Accepted Answer

Resistant bacteria made up a greater share of the population after exposure

Question 4

During a secondary immune response, what most directly allows a faster response to an antigen seen before?

Accepted Answer

Memory lymphocytes from the first exposure