The transfer of pollen from an anther to the stigma of a carpel is
A. fertilization.
B. coevolution.
C. germination.
D. pollination.
Answer: D
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Gamma rays cause biological damage in living systems by
A. producing reactive molecules such as superoxide and hydroxyl-free radicals. B. causing tiny gravity sinks and black holes to be formed in the substance. C. introducing toxins. D. making the substance radioactive.
Which of the following are incorrectly paired?
a. estrogen—maturation of female reproductive tract b. placenta—provides nutrients for developing offspring c. ovarian cycle—prepares uterus to receive egg d. menopause—cessation of ovarian cycle
Which statement about eukaryotic chromosomes is not true?
a. They sometimes consist of two chromatids. b. They sometimes consist only of a single chromatid. c. They normally possess a single centromere. d. They consist only of proteins. e. During metaphase they are visible under the light microscope.
Which of the following human diseases can be caused by microsporidia? (Check all that apply.)
A. Contact dermatitis B. Nephritis C. Encephalitis D. Diarrhea E. Pneumonia