Suppose you came across a novel organism you suspected belonged to one of the following animal phyla: Porifera, Cnidaria, Ctenophora, or Acoelomorpha
Which of the following characteristics would NOT be helpful in placing the organism into the correct phylum?
A) the organism's feeding strategy
B) the organism's habitat
C) whether the organism has a coelom
D) whether the organism has a gut
E) whether adults are sessile or motile
Answer: C
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G proteins are inactivated when ____
a. GDP is converted to GTP b. GTP is converted to GDP c. the G protein rebinds the receptor d. the G protein is released from the receptor e. the receptor is broken down
Which of the following antibodies would most likely be involved with the immune response against a microorganism entering the digestive or reproductive tract?
A) IgA B) IgD C) IgG D) IgM E) IgE
In the carbon cycle, one of the ways in which carbon is returned to the atmosphere is by respiration
____________________ Indicate whether the statement is true or false.
The ribosome is important for catalyzing the formation of peptide bonds. Which of the following statements is true?
(a) The number of rRNA molecules that make up a ribosome greatly exceeds the number of protein molecules found in the ribosome. (b) The large subunit of the ribosome is important for binding to the mRNA. (c) The catalytic site for peptide bond formation is formed primarily from an rRNA. (d) Once the large and small subunits of the ribosome assemble, they will not separate from each other until degraded by the proteasome.