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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology