Modern whales have bones that are remnants of a pelvis and legs that serve no function. This would be an example of a/an:
A) homologous structure. B) analogous structure.
C) vestigial character. D) polygenic character.
Answer: C
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9) A covalent bond is likely to be polar when _____
A) one of the atoms sharing electrons is more electronegative than the other atom B) the two atoms sharing electrons are equally electronegative C) carbon is one of the two atoms sharing electrons D) one of the atoms has absorbed more energy than the other atom E) the two atoms sharing electrons are the same elements
Which of the following features are common to both moss leaves and true leaves?
A. vascular strands B. chlorophyll a and b C. all the cells are haploid D. except at the midrib only one cell thick E. stomata
Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary. B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations. C. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated. D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated. E. All of these choices are TRUE
Which of the following terms best describes the cell in Figure 4.2?
a. Peritrichous flagella b. Amphitrichous flagella c. Lophotrichous flagella d. Monotrichous flagella e. Axial filament