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
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Which of the following might be a result of adding a secondary consumer to the aquatic ecosystem illustrated above?
A) a decrease in the number of primary consumers B) a decrease in the population of decomposers C) an increase in atmospheric carbon dioxide D) an increase in the population of scavengers E) a decrease in the carbon sink
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?
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.
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