Coccolithophores are abundant in:
a. cold marine waters.
b. tropical waters.
c. subtropical areas.
d. open ocean.
e. river mouths and estuaries.
A
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Which of the following terms best characterizes catabolite repression associated with the lac operon in E. coli?
A) negative control B) constitutive C) repressible system D) positive control E) inducible system
All of the following statements about population distribution are true EXCEPT
A. population distribution is the pattern of dispersal of individuals across an area of interest. B. a population's distribution is calculated as the number of individuals per unit area. C. environmental conditions, such as climate and altitude, are often limiting factors of distribution. D. behavioral traits, such as territoriality, can affect the distribution pattern of a population.
Membrane proteins that help move molecules across the plasma membrane are _______ proteins.
a) channel b) enzyme c) cytoskeleton d) cell recognition
One of the factors that helps animal-pollinated flowering plants transfer pollen to plants of the same species is that
A) pollinators are able to rapidly extract nectar from any species of flower, regardless of the pollinators' past or recent experience with a given flower type. B) most pollinators broadly use many different types of flowers. C) many pollinators have limited learning capacities and are most successful at obtaining food if they continue to visit the same type of flower after learning how to extract its nectar. D) pollinators only visit flowers that produce massive amounts of pollen.