Many seedless fruits are produced as genetically identical clones by asexual reproduction. Although advantageous in some ways, such genetically identical crops can be a disadvantage when
A. the environment is stable.
B. a disease is present.
C. mates are in short supply.
D. pollinators are absent.
Answer: B
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Which of the following is mismatched?
a. certain fungi; retinal destruction b. trachoma; damage to conjunctiva leading to blindness c. glaucoma; excess pressure of the aqueous humor d. astigmatism; vertical axis is longer than the horizontal axis of the eyeball e. cataract; gradual clouding of the lens
Which description illustrates the tertiary structure of a protein molecule?
a. bonding of two amino acids to form a dipeptide b. folding of a peptide chain to form an alpha helix c. association of several polypeptide chains by weak bonds d. order in which amino acids are joined in a peptide chain e. three-dimensional shape of an individual polypeptide chain
Deforestation affects the climate in what way?
A) Decreasing the habitat space for forest-dwelling animals B) Decreasing the amount of wood available for building shelter C) Increasing the levels of carbon dioxide D) Increasing the levels of oxygen E) Decreasing global temperature
Which of the following examples would be most likely to result in macroevolution?
A) a change in a regulatory gene, which has a major and adaptive impact on morphology B) a point mutation deep within an intron C) DNA-DNA hybridization D) gene flow E) genetic drift involving a trait that seems to exhibit neutral variation