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

Biology & Microbiology

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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.

Biology & Microbiology

Fleas are endoparasites.

Answer the following statement true (T) or false (F)

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology