Four of the five choices listed below are
characteristics of the plasma membrane. Select the
exception.
a. phospholipid
b. fluid mosaic
c. lipid bilayer
d. inert and impermeable
e. hydrophobic tails
Answer: d
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Conifers produce copious amounts of pollen during reproduction. What would be a likely consequence of a significant reduction in the amount of pollen produced by conifers?
A. There would be little effect because coevolved pollinators would still be able to transfer pollen from the male cones to the appropriate female cones. B. There would be a significant negative effect on the viability of seeds because double fertilization could not occur, so there would be no food available for the growing embryo. C. There would be a decrease in the number of seeds produced because the chances of pollen reaching a female cone of the same species would be reduced. D. There would be a significant decrease in the genetic diversity of embryos, but little effect on the number of seeds as only one pollen grain is necessary to fertilize a single female cone.
The differences in relative concentrations of ions inside and outside the cell act as an electrical force. The specific ion(s) MOST important to establishing the resting potential in neurons would be
A. Na+. B. K+. C. intracellular anions (e.g., proteins). D. H+. E. Na+, K+ and intracellular anions are all important.
Sexual reproduction
a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. requires less tissue differentiation than asexual reproduction. d. produces genetic clones. e. produces genetic clones and requires less tissue differentiation than asexual reproduction
____________________ secrete products such as sweat or digestive enzymes through ducts. Fill in the blank(s) with the appropriate word(s)