The "big bang" refers to
a. an event marking the beginning of the universe.
b. the extinction of the dinosaurs.
c. the inevitable end of the universe.
d. the collision of the first galaxies forming the universe as it is today.
e. the inevitable death of large stars.
ANSWER: a
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The perception of a certain pitch of sound depends partly on which of the following?
A. the amplitude of the sound waves B. which bones of the middle ear are moved C. which hair cells of the cochlea are stimulated D. where particles settle in the semicircular canals E. whether it is the round window or oval window that vibrates
Which organism is nonhemolytic on 5% sheep blood agar but hemolytic on human blood?
a. Weissella confusa b. A. haemolyticum c. Lactobacillus spp. d. G. vaginalis
An organism that lives in a deep marine environment may exhibit all the following physical characteristics, except
A) large eyes. B) bioluminescence. C) colorful skin pigmentation. D) streamlined body.
Which of the following statements about mitosis is true?
a. The chromosome number in the resulting cells is halved. b. DNA replication is completed in prophase. c. Crossing over occurs during prophase. d. Two genetically identical daughter cells are formed. e. It consists of two nuclear divisions.