Functional magnetic resonance imaging is used to observe brain function by:
a. examining intracellular second messengers.
b. monitoring gene activation.
c. examining changes in blood flow to different parts of the brain.
d. measuring neurotransmitter-receptor binding effectiveness.
e. measuring hormone levels.
C
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Which statement best explains why embryos with a missing autosome are not found among spontaneously aborted fetuses?
A. These embryos occur less often than those with an extra autosome. B. Fertilization does not occur under these circumstances. C. Pregnancy is not recognized because an abortion occurs shortly after fertilization. D. These embryos do not get aborted but continue to live birth. E. None of the statements are correct.
The potassium pump may be characterized as
a. typically open. b. allowing both sodium and potassium to pass through. c. an embedded protein in the plasma membrane in the neuron. d. resulting in a slight negative charge in the neuron. e. an embedded protein in the plasma membrane in the neuron that results in a slight negative charge in the neuron.
Which of the following statements regarding hemophilia is correct?
A) Hemophilia is caused by excessive production of factor VIII. B) Hemophilia is an inherited disorder, is characterized by excessive bleeding, and occurs only in males. C) Hemophilia is characterized by factor VIII deficit and is passed from asymptomatic fathers to daughters. D) Hemophilia is generally not an inherited disorder and affects males and females in equal numbers.
Scientists estimate that as much as one-fourth of all species will become extinct in the near future, a rate of extinction not seen on Earth since the Cretaceous mass extinction. How are humans contributing to this mass extinction? (Check all that apply.)A) Contributing to climate changeB) Intentionally killing all members of a speciesC) Destroying habitatD) Blocking evolution
What will be an ideal response?