Which response would be characteristic of the parasympathetic nervous system?
A) secretion of the hormone epinephrine
B) increase in blood pressure
C) vasoconstriction of blood vessels
D) decrease the rate of heart contraction
E) activation during times of stress
D
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The human b-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene?
A. stabilizing B. directional C. disruptive D. balanced E. negative frequency dependent
What is the diameter of a nucleosome?
What will be an ideal response?
Number, and number in relation the population
a. pattern b. frequency c. mode d. distribution
To provide motility, prokaryotic flagella whip back and forth while eukaryotic flagella rotate.
Answer the following statement true (T) or false (F)