Which of the following is a nitrogenous waste of desert-living animals that can be safely stored?

A) Amino acids
B) Urea
C) Ammonia
D) Ammonium
E) Uric acid

On coming inside from the cold, students notice that their cheeks are red. This results from

A) constriction of the blood vessels in the epidermis of the cheeks.
B) dilation of the blood vessels in the dermis of the cheeks.
C) damage to the epidermis by the cold.
D) constriction of the sweat glands in the cheeks.
E) increased permeability of superficial vessels.

breaks down fatty acids, amino acids, hydrogen peroxide, and poisons such as alcohol

A) vesicle
B) lysosome
C) peroxisome
D) vacuole

How might corrective lenses have affected human evolution?

A) Modern humans with faulty vision have decreased survivorship.
B) Modern humans with faulty vision have decreased reproductive success.
C) Modern humans with faulty vision can increase fitness by wearing corrective lenses.
D) none of the above

The mass extinction at the end of the Cretaceous period was likely the result of:

A) rising seawater.
B) loss of vegetation.
C) extreme predation.
D) a dramatic change in climate.
E) the appearance of new competitors.

___________ were originally designated the location of a particular gene on the chromosome.

A) Loci
B) Genotypes
C) Phenotypes
D) Alleles
E) Homozygous