The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum
B. attaching to the substrate
C. storing waste materials of the cell
D. filtering bacterial food from the water
E. directing currents away from the flagellum
Answer: D
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African sleeping sickness is caused by Trypanosoma brucei, a flagellated protist with a kinetoplast. Which of the following diseases is caused by a pathogen classified in the same supergroup of protists as T. brucei?
A. malaria B. giardiasis C. amoebic dysentery D. dinoflagellate toxin-induced nervous disorders
Sex differences in body growth are mediated by changes in growth hormone, insulin-like growth factor I and
A. thyroid hormone. B. estradiol and testosterone. C. prolactin. D. progesterone. E. cortisol.
Explain the need for a null hypothesis, especially in ecology and evolution. What does a null hypothesis accomplish?
What will be an ideal response?
Why is Chorionic villus sampling preferred over amniocentesis in some geographic regions?
a. Because it samples amniotic fluid and allows for a more accurate assay. b. Because the test is conducted earlier in the pregnancy, performed at 10-12 weeks. c. It is ofter conducted later in the pregnancy, at 15-20 weeks. d. Some workers report a lower success rate of correct karyotyping.