A membrane-bound sac used to transport substances into and out of cells is a

A.) pump
B.) macrophage
C.) lysosome
D.) vesicle


Ans: D.) vesicle

Biology & Microbiology

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The leading strand is the daughter strand that has its ____ end pointed toward the replication fork and is therefore synthesized ______

A. 3'; in a series of segments B. 3'; continuously C. 5'; in a series of segments D. 5'; continuously E. None of the answer options are correct.

Biology & Microbiology

Which of the following is a component of

sperm?

a. DNA b. enzymes c. mRNA d. yolk e. all of these are components of sperm

Biology & Microbiology

The maintenance of a high ATP to ADP ratio within cells ensures that:a

the hydrolysis of ADP to ATP will be strongly exergonic. b. the hydrolysis of ATP to ADP will be strongly exergonic. c. the hydrolysis of ATP to ADP will be strongly endergonic. d. the hydrolysis of ADP to ATP will be an energy releasing reaction. e. the conversion of ADP to ATP will proceed spontaneously.

Biology & Microbiology

What does fossil evidence show to differentiate Homo erectus from Homo habilis?

a. H. erectus did not use tools. b. H. erectus was shorter than H. habilis. c. H. erectus had a larger brain than H. habilis. d. H. erectus had more pronounced sexual dimorphism than H. habilis. e. H. erectus was the first member of the genus Homo without pronounced supraorbital ridges.

Biology & Microbiology