Mutations:
A) account for most of the change in allele frequency in a population.
B) may do nothing, may be harmful, or may be beneficial.
C) are always detrimental.
D) are always beneficial.
Answer: B
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The cells of visceral smooth muscles function as separate units, independent of neighboring cells.
Answer the following statement(s) true (T) or false (F)
Darwin proposed that natural selection occurs in an environment by
A. producing a constant number of offspring while in that environment. B. surviving for a fixed amount of time. C. resisting the environment and keeping the environment from changing. D. favoring those individuals with the most favorable acquired characteristics. E. favoring heritable features that make the organism better suited to survive and reproduce.
Which of the following amino acids has an aromatic R group?
A. aspartate B. proline C. threonine D. tyrosine E. arginine
Fruit-fly eyes are of the compound type, which is structurally very different from the camera-type eyes of mammals. Even the camera-type eyes of molluscs, such as octopi, are structurally quite different from those of mammals
Yet, fruit flies, octopi, and mammals possess very similar versions of Pax-6. The fact that the same gene helps produce very different types of eyes is most likely due to _____. A) the few differences in nucleotide sequence among the Pax-6 genes of these organisms B) variations in the number of Pax-6 genes among these organisms C) the independent evolution of this gene at many different times during animal evolution D) differences in the control of Pax-6 expression among these organisms