Mitosis and cytoplasmic division of a cell in an ovule
produces four __________, one of which gives rise
to the female gametophyte. Fill in the blank(s) with the appropriate word(s).
Answer: megaspores
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Many disorders are associated with defects in organelle function. Suggest a cellular consequence for a defect in lysosomal enzymes
What will be an ideal response?
A house plant seems to be growing slowly and lacks its normal bright green color. You call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is required before NADPH can function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.
Populations
a. are limited by only one factor at a time. b. increase arithmetically. c. increase indefinitely. d. are limited by the carrying capacity. e. are represented by a minimum of two different sizes.
Which of the following is a cornerstone of the science of ecology?
A) Environmentalism B) Darwin's theory of natural selection C) Economics D) Populations