A geneticist discovers a previously unknown variant in gene…

A geneticist discovers a previously unknown variant in gene X that is associated with hair loss in men.  It is a coding variant that changes a single amino acid of the protein sequence. Genetic testing of 1,000 male students at Texas A&M University indicates that the variant is present in 200 of the participants. Is this variant considered a mutation or a polymorphism?

In a metabolic pathway, succinate dehydrogenase catalyzes th…

In a metabolic pathway, succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, a substance that resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the amount of succinate molecules to those of malonic acid reduces the inhibitory effect of malonic acid. Which of the following statements correctly describes the role played by molecules described in the reaction?