Which of the following antimicrobial agents is the most toxic to humans?
A) 70% alcohol
B) ethylene oxide
C) quaternary ammonium compounds
D) chloramines
E) iodophors
B
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Four of the five answers listed below are differences between archaea and bacteria. Select the exception
a. cell wall components b. membrane components c. ribosomal RNA sequences d. DNA nucleotides e. DNA and histone organization
Why do decreased testosterone levels in men lead to infertility?
a. lower testosterone prevents sperm from being made b. lower testosterone prevents sperm from maturing c. lower testosterone inhibits sperm motility d. lower testosterone prevents ejaculation e. lower testosterone prevents the removal of the coating on the head of the sperm
Living organisms are members of all of the levels listed below. However, rocks are components of
a. the community. b. the population. c. the ecosystem only. d. the biosphere only. e. both the ecosystem and the biosphere.
Which type of ecosystem has low primary production but nonetheless contributes a large proportion of Earth's total net primary production?
A) tropical rain forest B) coral reef C) open ocean D) desert