Anaphase of mitosis occurs when:
a) the chromatids begin to separate from the metaphase plate.
b) the chromosomes line up on the 'equator'of the cell.
c) the cell enters interphase.
d) the chromatin coils into thicker, visible chromatids.
e) the nuclear envelope first breaks down.
Ans: a) the chromatids begin to separate from the metaphase plate.
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Which of the following statements best compares a pseudocoelom and a coelom?
A. A coelom is completely enclosed by mesoderm whereas a pseudocoelom has an outer covering of mesoderm and an inner one of endoderm. B. A pseudocoelom is completely enclosed by mesoderm whereas a coelom has an outer covering of mesoderm and an inner one of endoderm. C. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by endoderm. D. The pseudocoelom is enclosed by ectoderm and the coelom is enclosed by endoderm. E. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by mesoderm.
The direction of water movement across a cell membrane is determined in part by:
A. the pressure gradient existing between the inside and the outside the cell B. the concentration of solutes and the pressure gradient existing between the inside and the outside the cell. C. the levels of ATP in the cell. D. the concentration of solutes inside and outside the cell. E. the presence of transporter molecules.
Refer to Figure 44-2. Cell type__________ is/are primarily responsible for the release of histamine in
injured tissues and in allergic responses. a. A only b. B only c. C only d. D only e. A and cell type D
Fishing by humans has severely affected populations of many different marine species, including whales. Examine the figure above, making sure to note what each axis represents. What can best explain the pattern for minke whales?
A. Minke whales were too difficult to catch until they become malnourished due to exploitation competition by other whales. B. Minke whale populations were overfished in the early 1900s, then recovered in the 1970s as their competitors were killed off. C. Minke whales are a new species that evolved during the 1960s as an ecological niche opened up. D. Commercial whalers did not pursue minke whales until the more valuable whale species had declined.