What is a good estimate of the background rate of species extinction?

A) one species per day
B) one species per year
C) one species per millennium
D) one species per million years


Ans: B) one species per year

Biology & Microbiology

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Teeth aren’t exactly bones, but they’re made up of similar tissues and are subject to the same problems bones may have. In what way(s) do you predict the disease rickets might affect teeth?

_____ Periodontal disease: Redness and swelling elicited by bacterial infection of the gums. _____ Delayed formation: The baby teeth may not erupt until after one year. When they erupt, they may be smaller than normal. _____ Increased likelihood of cavities: Low vitamin C status prevents sufficient mineralization, allowing infection to establish on the teeth. _____ Canker sores: Painful mouth sores associated with bacteria and/or viruses.

Biology & Microbiology

Rh incompatibility is due to an immune reaction in a pregnant woman to which of the following?

A. a self-antigen on red blood cells B. a foreign antibody on red blood cells C. a foreign antigen on red blood cells D. a self-antibody on red blood cells E. None of the answer choices is correct.

Biology & Microbiology

All of the following are autoimmune diseases

EXCEPT a. Graves' disease. b. multiple sclerosis. c. rheumatoid arthritis. d. AIDS. e. lupus.

Biology & Microbiology

Which part of the brain detects thirst and produces antidiuretic hormone?

A. hypothalamus B. cerebellum C. corpus callosum D. cerebrum

Biology & Microbiology