Aerobic respiration evolved in
a. some bacteria.
b. some archea.
c. animals.
d. mitochondria.
e. in some bacteria and some archea.
Answer: e
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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
Following fertilization, an ovary will develop into ____________, whereas an ovule will become ______________
a. a. a fruit; a seed b. an embryo; a fruit c. a seed; an embryo d. a female gametophyte; a seed e. a fruit; a female gametophyte
The left ventricle has a more muscular wall than the other three chambers of the heart because the left ventricle
A) must generate enough blood pressure to pump blood into the aorta and throughout the body. B) pumps blood more rapidly than the other chambers. C) pumps blood into the atria. D) must decrease the amount of pressure on the blood so it can flow more smoothly. E) receives blood directly from major arteries.
Environmental resistance may limit the size of populations by
A) increasing both birth and death rates. B) increasing death rates and/or decreasing birth rates. C) decreasing death rates and/or increasing birth rates. D) changing the biotic potential. E) decreasing both birth and death rates.