How does 0.5 M sucrose (molecular mass 342) solution compare to 0.5 M glucose (molecular mass 180) solution?
A) Both have 6.02 × 1023 molecules.
B) Sucrose has 171 molecules, whereas glucose has 90.
C) Both have 3.01 × 1023 molecules.
D) Sucrose has 171 mg/L, whereas glucose has 90 mg/L.
Ans: C) Both have 3.01 × 1023 molecules.
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As a mechanism of evolution, natural selection acts on variants within populations and ultimately leads to the evolution of different species was proposed by
A. Mendel. B. Malthus. C. Founder. D. Lyell. E. Darwin.
The number of DNA molecules in a duplicated chromosome is
a. one. b. undetermined. c. half that of an unduplicated chromosome. d. two. e. four.
You are examining an ecosystem and notice a large bird. When you measure its temperature, you find it to be constant in sun or shade, wind or still air. This indicates the bird is a(n)
A. homotherm. B. ectotherm. C. endotherm. D. positherm. E. thermophile.
Plants could readily develop seasonal responses for flowering based on temperature changes but have "elected" through evolution to manage their rhythms based on a comparison of daylight and darkness. Why has the day-night ratio system been selected?
A. Temperatures fluctuate widely across seasons and from year to year, but photoperiod comparisons are a more reliable indicator of season. B. Temperature has no effect upon plant biochemistry. C. Temperature is a gradation but day/night is all-or-nothing. D. A plant's nervous system is tuned to light stimuli and not to temperature stimuli.