Which of the following occurs in prophase??

a. sister chromatids attach
b. DNA replicates
c. chromosomes align in the middle of the cell
d. the nuclear envelope breaks down
e. sister chromatids separate


Answer: d. the nuclear envelope breaks down

Biology & Microbiology

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Sexual dimorphism, as seen in the crayfish, is

(a) the presence of male and female individuals. (b) the production of eggs and sperm by the same individual. (c) another term for copulation. (d) the presence of observable differences between males and females.

Biology & Microbiology

Fungal diseases are usually divided into ________ groups according to the level of infected tissue and the mode of entry into the host.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Where in the brain is the corpus callosum?

a. between the cerebellum and the medulla oblongata b. below the cerebellum c. between the two hemispheres of the cerebrum d. between the pons and the midbrain e. between the thalamus and the hypothalamus

Biology & Microbiology

Which of the following is a function of reverse transcriptase?

A. It functions as a ribonuclease to degrade the viral RNA once it has been copied into DNA B. It functions as a DNA-dependent DNA polymerase C. It functions as a RNA-dependent DNA polymerase D. All of these are functions of reverse transcriptase. 

Biology & Microbiology