Morphogen distribution inside a cell
A. is homogeneous.
B. can arise due to localized secretion by neighboring cells and occur prior to fertilization.
C. can be established prior to fertilization of the oocyte.
D. can arise due to localized secretion by neighboring cells.
E. is dependent on CAMs.
Answer: B
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A decline in the production of melatonin, which is secreted by the _____, begins at puberty
a. pineal gland b. thymus c. adrenal gland d. gonads
Thomas Malthus proposed that
a. species gradually improved over generations because of an inherent drive toward perfection b. humans reproduce beyond the capacity of their environment to sustain them. c. the food supply and populations multiplied at the same rate. d. artificial selection was the key to evolution. e. natural selection was the key to evolution.
Red algae can grow at greater ocean depths than most other algae can because red algae are
A. specialized for absorbing red wavelengths of light for photosynthesis B. specialized for absorbing ultraviolet wavelengths of light for photosynthesis C. specialized for absorbing blue wavelengths of light for photosynthesis D. unable to use chlorophyll for photosynthesis E. adapted for chemosynthesis, rather than photosynthesis
What is the principal energy storage molecules of plants and animals?
A. sugars. B. proteins. C. lipids. D. vitamins. E. carbohydrates.