In the broadest definition, cells can communicate with other tissue types via _____
Fill in the blank(s) with the appropriate word(s).
extracellular secretions
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The plasma membrane _____
a. controls the contents of the cell b. is composed mostly of cholesterol c. is permeable to ions and polar molecules d. is free of proteins e. is rigid and impermeable
A population that is growing exponentially in the absence of limiting factors can be illustrated by which shaped curve?
a. S-shaped b. J-shaped c. O-shaped d. bimodal e. skewed
In the electron transport chain, why do electrons flow in one direction from NADH to O2 rather than the reverse direction, or randomly?
A. Electrons flow from NADH to O2 because NADH has the most negative reduction potential and O2 the most positive with electron carriers in between, each becoming more positive to direct the electron flow. B. Electrons flow from NADH to O2 using ATP as a source of energy to drive the flow against their gradient from most negative reduction potential to most positive. C. Electrons flow from NADH to O2 because the change in free energy directs the electron flow from the molecule with the most positive reduction potential to the one with the most negative. D. Electrons flow from NADH to O2 because NADH has the most positive reduction potential and O2 the most negative with electron carriers in between, each becoming more negative to direct the electron flow.
About how many base pairs are there in the DNA of human cells?
A. 1 million B. 20 million C. 3 billion D. 10 billion E. 100 billion