The extracellular matrix of an animal cell is composed of:
A. collagen.
B. cadherin.
C. cellulose.
D. All of the above are correct.
A
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Which statement about the PiZ allele is not true? Consult Figure 15.2 if necessary
A. The PiZ allele is common in populations of European descent. B. One out of 30 Caucasians in the United States is heterozygous for the PiZ allele. C. Individuals homozygous for the PiZ allele have normal lung elasticity. D. Nonsmokers who are homozygous for the PiZ allele have a life-expectancy of 65 years. E. Smokers who are homozygous for the PiZ allele have a life-expectancy of 40 years.
There is a standing debate among biologists involved in looking for life on other planets as to how any alien organisms should be handled. Some feel that alien organisms should not be introduced on Earth; others feel that investigating these alien organisms will provide important information. What are some of the arguments on both sides?
What will be an ideal response?
Why are population projection matrices so complicated?
A) because plant sizes are fixed over time B) because larger populations require more sophistication C) because fecundity is high in some species D) because some species can move back and forth between life stages
What is a deficiency of water in the body?
A) diffusion B) dehydration C) endocytosis D) hypertension