Costameres, in which cytosolic actin filaments are linked to extracellular laminins through dystrophin–dystrogylcan complexes, are found in
A) skin cells.
B) intestinal epithelial cells.
C) striated muscle cells.
D) nerve cells.
E) pancreatic cells.
Answer: C
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Which of the following is a step in a PCR?
A. DNA is cooled to a temperature at which the hydrogen bonds holding the strands break. B. The primers anneal to the complementary sequences on the template DNA C. DNA gyrase enzyme relieves the supercoiling ahead of the replication fork. D. The DNase I synthesizes a new strand of DNA that is complementary to the template DNA.
Neurotransmitters that bind to G-protein coupled receptors act more rapidly than those binding to ionotropic receptors
Indicate whether the statement is true or false.
__________ in annelids regulate the composition of
body fluid. Fill in the blank(s) with the appropriate word(s).
Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction for which reason?
A. They can no longer evolve. B. Their rate of breeding will decline. C. They may be more susceptible to changes in the environment or disease. D. They are at risk of sympatric isolation. E. They are at risk of developing prezygotic barriers to reproduction.