In eukaryotic cells, which occurs during the prophase of mitosis?
a. duplication of chromatids
b. replication of DNA
c. separation of sister chromatids
d. breakup of the nuclear envelope
e. appearance of the nuclear envelope
ANSWER: d
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In a small population, both _________ and __________ would violate the conditions of Hardy-Weinburg equilibrium
A. random mating; genetic drift B. gene flow, random mating C. lack of natural selection, gene flow D. sexual selection, lack of new mutations E. gene flow, genetic drift
Regions of a specimen with higher electron density scatter ________ electrons and, therefore, appear ________ in the image projected onto the screen of a transmission electron microscope.
A. fewer; lighter B. more; lighter C. fewer; darker D. more; darker
Which statements about centrioles is false?
a. They are found in the centrosome. b. They are duplicated before cell division. c. They have a 9 + 2 arrangement of microtubules. d. They are thought to play a role in microtubule assembly. e. They are present in most animal cells but not most plant cells.
Which of the following is not a characteristic of all living things?
A) They contain carbohydrates, proteins, lipids, and nucleic acids. B) They are composed of multiple cells. C) They have adaptive traits. D) They respond to stimuli.