Refer to the paragraph on Rhodopsins. Which of the following best describes this particular protein?
A) integral
B) peripheral
C) external
D) internal
Answer: A
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Species of both Shigella and Streptococcus
A. invade host cells. B. produce a toxin. C. cause ergot poisoning. D. are delivered via flea bites. E. invade host cells AND produce a toxin.
In the figure above, the viral DNA in the
lysogenic pathway
a. has been destroyed by host bacterial enzymes. b. is integrated into the bacterial chromosome. c. has been copied and changed into bacterial DNA. d. is no longer present. e. has been transcribed into RNA
The larva in Figure 31-4 is:
A. a veliger.
B. a glochidium.
C. a trochophore.
D. a nauplius.
E. a pupa.
While on a hike, you notice that several burrs have become attached to your socks. You quickly pull them off. Inside the burr are several seeds. Burrs are produced by certain plants and frequently catch on animal fur (or people's clothing)
After thinking about it, you decide that the burr is a type of ________ that is an adaptation for ________. A) leaf...protecting plants from herbivores B) fruit...seed dispersal C) cambium...seed protection D) pollen grain...successful pollination