In a population growing exponentially,
a. the number of individuals added to the population next year is less than the number added
this year.
b. the population growth rate decreases year after year.
c. net reproduction per individual increases year after year.
d. the number of individuals added to the population next year is greater than the number
added this year.
e. the number of individuals in the population will level off after ten generations.
D
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According to the fluid mosaic model of cell membranes, the fluid part of the model refers to ____
a. the constant movement of the hydrophilic tails in the interior of the membrane b. a thin layer of water found sandwiched between the two layers of phospholipids c. the phospholipid molecules which vibrate, spin, and exchange places within the same layer of the bilayer d. the free movement of cholesterol molecules within the membrane e. the frequent flip-flop of phospholipids from one side of the membrane to the other
Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few groups of nitrogen-fixing bacteria. B. the breakdown of minerals. C. a few genera of detritivores. D. the breakdown of dead plants. E. nitrogen-containing fertilizers.
How is natural selection related to sexual reproduction as opposed to asexual reproduction?
A) Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction. B) Sexual reproduction results in the greatest number of new mutations. C) Sexual reproduction allows the greatest number of offspring to be produced. D) Sexual reproduction utilizes far less energy than asexual reproduction.
Through which plant cells does water move by capillary action?
a) phloem cells. b) guard cells. c) mesophyll cells. d) xylem cells.