Primary active transport results in which of the following?
a. A charge difference across a membrane
b. A pocket forming around target particles
c. The formation of additional ATP
d. The reduction in extracellular fluid
a. A charge difference across a membrane
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Infections that are acquired during sexual activity are referred to as:
a. endogenous infections. b. pyelonephritis. c. exogenous infections. d. upper tract infections.
The lacP site within the lac operon is upstream of the genes that encode for lactose uptake and metabolism proteins. The lacP site is
A. the lac promoter site. B. where RNA polymerase binds. C. the site where genes are transcribed that encode proteins for metabolizing lactose. D. the lac promoter site where RNA polymerase binds. E. the lac promoter site, where genes are transcribed that encode proteins for metabolizing lactose.
Arteries
a. are under greater pressure than veins. b. are thinner than veins. c. carry blood toward the heart. d. have valves to prevent backflow.
Living cells typically have biosynthetic pathways to synthesize at least some of the amino acids used in making proteins. Some strains of E. coli, a prokaryote, can synthesize the amino acid tryptophan, while other E. coli strains cannot. Similarly, some strains of the yeast S. cerevisiae, a eukaryote, can synthesize tryptophan, while other S. cerevisiae strains cannot. Which of the following describes the most likely source of genetic variation found in the tryptophan synthesis pathways of both species?
(A) Exchange of genetic information occurs through crossing over. (B) Viral transmission of genetic information required to synthesize tryptophan occurs. (C) Random assortment of chromosomes leads to genetic variation. (D) Errors in DNA replication lead to genetic variation.