Four of the five features listed below characterize a
group of chordates. Select the exception.
a. feathers
b. ectothermic
c. four-chambered heart
d. hollow skeleton
e. no teeth
Answer: b
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Alanine and lysine are both amino acids. Not eating enough lysine can lead to protein deficiency, whereas not eating enough alanine does not lead to protein deficiency. Why is this the case?
A. Alanine can be synthesized by cellular biochemical pathways, whereas lysine cannot. B. Alanine can be easily replaced by other amino acids in protein synthesis, whereas lysine cannot. C. Lysine is needed in much larger quantities for protein synthesis than alanine. D. The body has a more difficult time absorbing lysine than alanine, so more must be consumed to avoid protein deficiencies. E. All of the answer options are correct.
Which of the following contribute to both
leaching and soil erosion? a. strong winds b. mineral composition of soil c. moving water d. climate e. none of these
Phosphorus is an essential element in all living things and is a component of
A. ATP and DNA. B. most amino acids. C. nearly all vitamins. D. carbohydrates.
Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem. This process is called
A. a bottom-up effect. B. species turnover. C. disruption. D. ecosystem stabilization. E. a trophic cascade.