Certain plants that grow in environments where their roots are often under water need to provide ways of getting which of the following to the roots?
A. carbon dioxide.
B. hydrogen.
C. nitrogen.
D. oxygen.
E. carbon monoxide.
Answer: D
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Figure 15.1 shows the three alleles for the beta-globin gene. Which of the following statements best describes the effect of having the S allele, which codes for sickle-cell anemia?
A. Having the allele is always harmful. B. Having the allele is always beneficial. C. The effect depends on whether the allele occurs in its homozygous or heterozygous form. D. The effect depends on the environment (i.e., whether malaria is present). E. The effect depends on whether the allele occurs in its homozygous or heterozygous form, and the environment (i.e., whether malaria is present).
A variation of the PGD method, called ____________________, can test for genetic disorders in the egg before
fertilization Fill in the blank(s) with the appropriate word(s).
Which is the least inclusive of the taxonomic categories listed below?
A. Family B. Phylum C. Class D. Order E. Genus
Which of the following is a component of GCS?
a. skin response b. flexion response c. eye opening d. pupillary response