In yeast chromosomes, centromeres
A) help distinguish one chromosome from another.
B) are closely related in sequence.
C) are only 10–15 bp long.
D) contain satellite DNA.
B) are closely related in sequence.
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What evidence exists that some of the asteroids were geologically active in the distant past?
a. A few of the larger asteroids show similar reflectance spectra (colors) similar to achondrite stony lava-like meteorites. b. A few of the larger asteroids show similar reflectance spectra (colors) similar to carbonaceous chondrite meteorites. c. A few of the larger asteroids show similar reflectance spectra (colors) similar to Jovian planets.
Which of the following choices is a feature of mitosis but not meiosis?
a. does not make exact copies of the original cell b. favors crossing over c. produces clones of parent cell d. has two cell divisions
Companion cells are connected via plasmodesmata to
a. trichomes. b. tracheids. c. sieve tube members. d. guard cells. e. vessel members.
What phrase best describes the field of epidemiology?
A. It is the study of factors that control the presence or absence of disease. B. It is the study of infectious disease. C. It is a direct and experimental science. D. It begins with laboratory studies on experimental animals. E. It is none of these.