While lancelets, members of the lineage ____, live mostly buried in the sand in warm, shallow marine habitats, they
do have well-developed segmented muscles and can move.
a. Petromyzontoidea
b. Placodermi
c. Cephalochordata
d. Urochordata
e. Myxinoidea
ANSWER: c
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For each six atoms of carbon dioxide fixed in the light-independent reactions, how many molecules of PGAL (phosphoglyceraldehyde) are produced?
a. 2 b. 3 c. 6 d. 12 e. 15
While the pH of saliva ranges from 6.5 to 11.5, the pH in the stomach is about pH 2. What would you expect the optimum pH to be for the enzymes secreted into your stomach that digest proteins into amino acids?
What will be an ideal response?
The presence of an El Niño event may produce damaging __________ changes in a coral reef
a. chemical b. pH (a measure of acidity) c. temperature d. None of these answers is correct
Rotifers take their name from
a. their tumbling movements through the water. b. actions of cilia on their head. c. their radial symmetry. d. their elaborate digestive system. e. rotational action around the central body axis