Because females carry two X chromosomes and males carry only one, females have higher levels of all products encoded by genes on the X chromosome

a. True
b. False
Indicate whether the statement is true or false


False

Biology & Microbiology

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Outline the four characteristics of cancer

What will be an ideal response?

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The carrier molecules used in active transport are

a. calcium ions in the calcium pump. b. proteins. c. ATP molecules. d. carbohydrates. e. lipids.

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Which blood vessel is next to living cells in nearly all body tissues?

a. venules b. arterioles c. capillaries d. veins e. arteries

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Scientists now believe that comets falling to early Earth played a role in the evolution of life. What role did these comets play?

A) They brought CO2 and H2O. B) They generated a lot of energy when they hit Earth. C) They brought ammonia ions (NH4). D) All of the above are true.

Biology & Microbiology