Which of the following is NOT evidence to support the endosymbiotic theory of the origin of mitochondria?
A. Mitochondria are produced from the host cell's DNA, which may have been derived when a segment of the engulfed cell's DNA was inserted into the host cell's genome.
B. The mitochondrial ribosomes closely resemble bacterial ribosomes.
C. Mitochondria are about the size of a proteobacterium.
D. Mitochondria display a double membrane that is similar in structure to the plasma membrane of living cells.
Ans: A. Mitochondria are produced from the host cell's DNA, which may have been derived when a segment of the engulfed cell's DNA was inserted into the host cell's genome.
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If you were to design a long-term research study to determine why there are no human births in Lapland during the months of August, September, and October, you would need to also examine a comparison population of humans in which births took place every month. The primary reason for including a comparison population within the design of this experiment would be to:
A. accumulate more facts that could be reported to other scientists. B. test the effects of more than one variable at the same time. C. prove that there are no births in Lapland during August, September, and October. D. act as a control that would ensure that the results obtained are due to a difference in only one variable.
What term best describes all of the species that live in a particular region?
a. population b. habitat c. niche d. community e. ecosystem
The large vessels that carry blood to the heart are
A. arteries. B. veins. C. capillaries. D. lymph vessels. E. sieve tubes. Veins carry blood to the heart
Which of the following is a function of the nucleus?
A. stores DNA B. stores sugars C. builds proteins D. packages proteins