HIV carries an enzyme called reverse transcriptase, which functions to ________
a. penetrate the cell membrane
b. copy viral RNA into viral DNA
c. copy viral DNA into viral RNA
d. destroy the host cell genome
b
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If a plant's stomata were always closed, how would this affect the plant's ability to make glucose?
A. There would be no effect on the ability of the plant to make glucose B. Plants would be able to make more sugar than normal C. Plants would make less sugar than normal Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about how stomata and gas exchange in plants? What other information is related to the question? Choose Answer Do you have all the information needed to determine what would happen to the plant with closed stomata? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Pyrimidines and purines can exist in alternate forms, or tautomers, shown here. Under common cellular conditions (physiological pH) the most common form of each purine or pyrimidine is shown on the left, and the rare tautomer on the right
Tautomers differ in the placement of hydrogen atoms and double bonds. Consider cytosine and its tautomer, the rare imino form of cytosine. With which nitrogenous base will the imino form of cytosine most likely base pair in a double stranded DNA? A. adenine B. cytosine C. guanine D. thymine E. uracil
The biome at the top of a very high mountain at the
equator is a type of a. alpine tundra. b. taiga. c. savanna. d. mountain coniferous forest. e. arctic tundra
Junctions between adjacent epithelial cells that allow for some movement between cells so that tissues can stretch and bend are called gap junctions.
a. true b. false