The way in which an organism utilizes its environment may be called
A. resource partitioning.
B. its habitat.
C. competitive exclusion.
D. intraspecific competition.
E. its niche.
E. its niche.
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When RNA polymerase catalyzes the addition of a nucleotide to a growing mRNA chain, a byproduct of this reaction is
A. pyrophosphate. B. water. C. orthophosphate. D. phosphate.
You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. B. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. D. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. E. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates.
In prokaryotes, high levels of cAMP ____
a. are present when glucose levels are high
b. are present when glucose levels are low c. negatively regulate the lac operon d. promote CAP production e. lead to CAP degradation
A number of different types of microscopy exist. Each type of microscopy has advantages and disadvantages. Can you identify the microscope that would be most advantageous for the situations below?
a. A cell biologist wishes to visualize the ribosomes of a cell. b. A microbiologist wishes to examine the motility of a bacterium. c. An immunologist wishes to determine if a lymphocyte possesses a certain surface protein. d. A virologist is trying to determine the three-dimensional shape of a virus. e. A pathologist is trying to examine the cytoplasm of a cell for changes that result from viral infection. What will be an ideal response?