The distal convoluted tubule
A. reabsorbs glucose.
B. secretes water.
C. increases the amount of protein in the nephron.
D. regulates ions.
D. regulates ions.
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Indicate whether the statement is true or false.
Consider the example of sickle-cell anemia and the allele for the sickle-cell trait, and answer the following
t or f: Eventually, natural selection will typically result in the sickle-cell allele being fixed in the population. t or f: Selection at this locus is an example of disruptive selection. t or f: This is an example of stabilizing selection and will decrease the variation at this locus in the population. t or f: This is an example of stabilizing selection and will maintain variation at this locus. t or f: Hypothetically, if homozygous recessives had the highest fitness (i.e. selection was directional) of the three genotypes discussed in the text, then natural selection would lead to fixation of the sickle-cell allele. What will be an ideal response?
Water has an important stabilizing effect on temperature in living organisms and their environments because as water absorbs heat, much of the energy is used to ____ instead of raising the temperature
a. create hydrogen bonds b. create covalent bonds c. break surface tension d. break hydrogen bonds e. create hydration layers
Which of the following mammals has NOT been successfully cloned?
a. sheep b. pigs c. humans d. nonhuman primates e. dogs