Crossing-over and synapsis occur during 

A. prophase of mitosis only.
B. prophase I of meiosis only.
C. prophase II of meiosis only.
D. prophase I and prophase II of meiosis.


B. prophase I of meiosis only.

Biology & Microbiology

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Cartilaginous fish (chondrichthyes):

A. have well-developed kidneys. B. may have teeth made of bone. C. are generally freshwater species. D. have a swim bladder.

Biology & Microbiology

Life probably never would have emerged if the ancient atmosphere had been the same as the present one because this molecule interferes with the assembly of simple organic compounds:

a. nitrogen b. oxygen c. hydrogen d. silica e. carbon dioxide

Biology & Microbiology

When, how, and to what extent any gene control

mechanism comes into play depends on a. the type of cell. b. the cell’s function. c. the cell’s chemical environment. d. signals from the cells external environment. e. all of these.

Biology & Microbiology

Which of the following domains only contain one kingdom?

A. Fungi and Protista B. Bacteria and Fungi C. Animalia and Plantae D. Archaea and Bacteria E. Protista and Animalia

Biology & Microbiology