How many stop codons are there in the genetic code?
A. five
B. one
C. four
D. two
E. three
Answer: E
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At a minimum, primary producers require water, carbon dioxide, and light. These are things that are readily available in most ecosystems. However, we do not observe the same rates of net primary productivity in every region of the globe
Which of the following statements best reflects one reason why rates of productivity are not the same everywhere? A. Rates of net primary productivity are actually the same everywhere; scientists just need to calculate the rates relative to plant biomass in a given ecosystem. B. Although water is limited in certain ecosystems, nutrients that are scarce actually limit net primary productivity because they are necessary for growth. C. Although water is limited in certain ecosystems, irrigation would solve the problem and equalize rates of net primary productivity in every ecosystem. D. Rates of net primary productivity are actually limited by the amount of solar radiation. If net primary productivity were calculated as a yearly average, then this would show that ecosystems have the same rate of productivity.
What differentiates gram-positive bacteria from gram-negative bacteria?
a. the presence of a nucleus b. the presence of ribosomes c. the composition of the cell wall d. the shape of the cells e. the method of reproduction
After a muscle cell contracts, which of the following must occur for the muscle to stop contracting?
A. Calcium ions must be pumped back into the endoplasmic reticulum. B. Calcium ions must flow out of the endoplasmic reticulum. C. Calcium ions must flow into the muscle cell. D. Calcium ions must flow out of the muscle cell. E. Calcium ions must be pumped out of the muscle cell.
If you traveled back in time and met a living hominin, which clues might tell you that your new friend was in the genus Australopithecus and not Homo?
A) The hominin was bipedal. B) You were in Africa. C) The hominin had a relatively large brain. D) You had traveled 3.5 million years into the past.