Which of the following organisms would most likely be first to colonize an area undergoing succession?
A. large mammals
B. oak trees
C. mosses
D. small mammals
E. insects
C
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ADH controls how diluted or concentrated urine is by controlling the:
A. permeability of the collecting ducts to water. B. permeability of the collecting ducts to electrolytes. C. permeability of the collecting ducts to urea. D. permeability of the loops of Henle to water. E. permeability of the loops of Henle to electrolytes.
The carposporphyte ____
a. is a gametophyte b. remains in the female gametoypyte c. contains four sperm cells d. is unique to green algae e. grows into the macroscopic algal form.
The nicking of DNA that initiates recombination during mitosis may be due to all of the following EXCEPT
A) instructions from the normal cell cycle program. B) X-rays. C) chemical damage. D) physical damage. E) radiation.
A mutation in the IGF2 gene in pigs results in a three-fold increase in the transcriptional activity of this gene in muscle
cells; therefore, these pigs are leaner and more muscular. Because this mutation is located in the noncoding region of the IGF2 gene, we can infer that:a. the IGF2 gene is a prokaryotic gene. b. the IGF2 gene is present only in muscle cells, but not in adipose (fat) cells. c. the mutation changes the amino acid sequence of the IGF2 protein. d. the mutation alters the regulatory region of the IGF2 gene. e. less IGF2 protein is synthesized in the muscle cells of these pig