Living cells have an intact phospholipid bilayer that separates the cell from its external environment; this structure is commonly referred to as the
a. nucleus.
b. mitochondria.
c. endoplasmic reticulum.
d. plasma membrane.
Ans: d. plasma membrane.
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The ATP synthase complex in the thylakoid membrane
A) contains an embedded CF1 component and a protruding CFo component. B) is identical to the FoF1 complex of mitochondria. C) performs photophosphorylation in oxygenic phototrophs. D) contains an assembly of hydrophobic polypeptides that function in ATP synthesis. E) all of the above
In the text example, the change in moth populations
from predominantly light- to dark-winged forms was the result of a. environmental changes. b. natural selection. c. food choices by predators. d. the ability of birds to find the prey. e. all of these.
A photograph formed using a microscope is called a(n)
a. spectrograph. b. x-ray. c. stereograph. d. micrograph. e. microphoto.
Why is only one strand of DNA transcribed into mRNA?
a. Because mRNA is only required in small quantities. b. Because transcribing both DNA strands would produce different amino acid sequences. c. Because the other strand would produce the same amino acid sequence in reverse order. d. Because all genes are located on the same DNA strand, while the other strand acts as protection. e. Because the other strand is transcribed directly into amino acids.