Adenine and thymine form _______ hydrogen bonds between them, while cytosine and guanine form _______ bonds

A. 2 , 3
B. 3 , 4
C. 3 , 2
D. 4 , 3


A

Biology & Microbiology

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Which of the following might be a result of adding a secondary consumer to the aquatic ecosystem illustrated above?

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In addition to mutation, what other mechanism allows for new genetic information to be introduced into a population? Explain your answer.

What will be an ideal response?

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In order to activate the cell mediated arm of the

adaptive immune response, which of the following must occur?

a. A naïve helper T cell must bind to an antigen-presenting dendritic cell. b. A naïve B cell must be activated in order to activate the effector helper T cell. c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell. d. A damaged or infected body cell must pass through a lymph node in order to activate T cells. e. None of these will activate the cell mediate arm.

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The endoplasmic reticulum, Golgi body, and other membranous organelles of cells might have formed by numerous infoldings of the cell's outer membranes.

a. true b. false

Biology & Microbiology