Which molecules most easily diffuse across a cell membrane?

a. ionic
b. large, polar
c. large, hydrophilic
d. small, hydrophobic
e. large, hydrophobic


ANSWER: d

Biology & Microbiology

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Which of the following is a major finding from the ENCODE project?

A. DNA methylation usually signifies the activation of gene expression B. In humans, one gene encodes exactly one protein. C. Gene regulation is achieved through a complex network of regulatory regions throughout the genome. D. Less than 20% of human DNA is linked to biological function. E. There are more than 10 million regulatory sites in human DNA.

Biology & Microbiology

Drugs that target peptidoglycan do not affect eukaryotes

Indicate whether this statement is true or false.

Biology & Microbiology

Bases are compounds that do all the following except

a. they bind hydrogen ions. b. they release hydrogen ions. c. they are pH 7 or above. d. they contain more hydroxide ions than hydrogen ions. e. they raise pH.

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When cells are not responding to normal

controls over growth and division, they form a tissue mass known as a a. metastasis. b. malignancy. c. tumor. d. carcinogen. e. nucleosome

Biology & Microbiology