Which is responsible for muscle pain felt after repeatedly lifting weights?
A a buildup of ethanol due to aerobic respiration
B a buildup of ethanol due to anaerobic respiration
C a buildup of lactic acid due to aerobic respiration
D a buildup of lactic acid due to anaerobic respiration
D a buildup of lactic acid due to anaerobic respiration
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Which is NOT a typical site for the occurrence of
meiosis? a. plant ovary b. plant root cells c. human testis d. human ovary e. plant anther
Which of the following statements is false?
a. Only B cells and their progeny make antibodies. b. The primary immune response is faster and more complete than a secondary immune response. c. Naive B cells already have antibodies but have not yet encountered an antigen. d. Macrophages will digest invading bacterial cells but do not destroy the antigens that eventually become mounted on their surfaces. e. B cell progeny may differentiate into memory cells.
The nervous system
a. acts only to adjust the contraction of skeletal muscle. b. initiates the rate and strength of cardiac contraction. c. can only adjust the rate and strength of cardiac contraction. d. has no direct control at all over cardiac function. e. acts only to adjust the contraction of smooth muscle.
Evolution can be used to explain all of the following except:
A) constant change in populations of organisms. B) the appearance of antibiotic-resistant strains of bacteria. C) the separate creation of each species. D) common characteristics of related species.