During photosynthesis, carbon dioxide diffuses from the atmosphere into the leaves through pores called
A. plasmodesmata.
B. stomata.
C. companion cells.
D. sieve tubes.
E. guard cells.
B. stomata.
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When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form. B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1 C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2 D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1 E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
Which of the following studies the relationship between genetic variation and the environment?
A. Population genetics B. Transmission genetics C. Molecular genetics
Which nucleotide forms the tail of a completed
messenger RNA transcript?
a. adenine b. thymine c. cytosine d. guanine e. a combination of more than one of these
Bacteria in the genus Salmonella are frequent causes of serious food contamination. Which of the following methods would provide rapid confirmation that a Salmonella species was a contaminant in food suspected of causing food "poisoning"?
A. phage typing B. biochemical tests C. physical characteristics D. analysis of nucleic acids E. serological tests