Tight junctions are composed of networks of all of the following except
a. claudin.
b. occludin.
c. junctional adhesion molecules.
d. integrin.
Ans: d. integrin.
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Which of the following statements about isotopes in living systems is false? a. Radiation can be used to create visual images
b. Living organisms can avoid taking up a radioactive isotope but still absorb the normal isotope of the same element. c. Radioactive sugar is used to measure rates of cell activity. d. Radioisotopes can be used as tracers to follow the movement of an element through a living system.
In four o'clock plants, reciprocal crosses are performed with a green plant and a white plant. How will the offspring of the reciprocal crosses look?
A) The offspring of both crosses will be green. B) The offspring will be white if the egg came from the white plant and green if the egg came from the green plant. C) The offspring will be white if the sperm came from the white plant and green if the sperm came from the green plant. D) The offspring of both crosses will be variegated.
Which of the following statements is NOT true?
a. All isotopes of an element have the same number of electrons. b. All isotopes of an element have the same number of protons. c. All isotopes of an element have the same number of neutrons. d. We refer to isotopes by mass number. e. 12C and 13C are isotopes.
All metabolic disorders result in serious phenotypic consequences. Indicate whether the statement is true or false