The operation of natural selection depends upon the fact that ____
a. the strong always survive, whereas the weak always die
b. some individuals have a better chance to produce more offspring
c. mutations are always harmful
d. acquired characteristics are inherited
e. reproduction of all members of a species follows the same path
ANSWER: b
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Dosage compensation refers to the fact that:
A. the level of expression for a given gene is directly related to the number of copies of the gene. B. genes on the Y chromosome must be expressed at higher levels than would otherwise be the case because they are not homologous with genes on the X chromosome. C. genes on the X chromosome must be expressed at lower levels than would otherwise be the case because they are not homologous with genes on the Y chromosome. D. X chromosome genes must be regulated differently in males and females because members of one sex have 2 X chromosomes, whereas members of the other have only 1. E. None of these choices are correct.
Fleas are endoparasites.
Answer the following statement true (T) or false (F)
The higher rates of diffusion and photosynthesis under elevated atmospheric concentrations of CO2 have been termed the ________
Fill in the blank(s) with correct word
Assume that the molar percentage of thymine in a double-stranded DNA is 20. What are the percentages of the four bases (G, C, T, A)? If the DNA is single-stranded, would you change your answer?
What will be an ideal response?