Which of the following is NOT involved in
nitrogen fixation?
a. breaking triple bonds
b. production of ammonia
c. production of NO3
?
d. production of NH4
+
e. All of these are involved in nitrogen
fixation
C
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The natural loss of dead cells from the surface of your skin is a result of:
A. loss of adherens junctions between epithelial cells. B. breakdown of desomsomes. C. loss of microvilli. D. Answers a and b are both correct.
Look carefully at the image of the human karyotype shown in Figure 11.3. What is the significance of the small differences between homologous chromosomes?
A. Each homologous chromosome in a pair is from a different parent. B. Some of this person's DNA is mutated, possibly causing disease. C. Chromosomes may not be completely replicated during S phase. D. The differences are a result of the way the material was prepared.
Many male birds will expend a great deal of energy building nests. Females will mate with the males who build the
best nests. This is best described as an example of ____.
a. natural selection b. sexual selection c. runaway selection d. an invasive species e. disruptive selection
Secondary metabolites are organic compounds produced outside of primary metabolic processes essential for cell structure and growth. Based on this information, which of the following is an example of a secondary metabolite?
A. steroids B. glucose C. lipids D. proteins E. RNA