Which flatworms are parasites of vertebrates and have a head modified into a scolex with hooks and suckers for attaching to places such as the intestinal wall of hosts?
a. Trematoda
b. Cestoda
c. Turbellaria
d. Polychaeta
Ans: b. Cestoda
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Indicate whether the statement is true or false
A fat (or triacylglycerol) would be formed as a result of a dehydration reaction between _____
A) one molecule of 9 and three molecules of 10 B) three molecules of 9 and one molecule of 10 C) one molecule of 5 and three molecules of 9 D) one molecule of 5 and three molecules of 10
Which part of the mammalian brain is
disproportionately smaller than the corresponding part of a fish brain? a. medulla oblongata b. thalamus c. pons d. midbrain e. cerebrum
In the nematode C. elegans, ced-9 prevents apoptosis in a normal cell in which of the following ways?
A) It prevents the caspase activity of ced-3 and ced-4. B) Ced-9 remains inactive until it is signaled by ced-3 and other caspases. C) Ced-9 cleaves to produce ced-3 and ced-4. D) Ced-9 prevents blebbing by its action on the cell membrane.