The membranes that protect the brain and spinal cord are called
a) gray matter.
b) cerebrospinal membranes.
c) epithelium.
d) meninges.
e) ventricles.
Ans: d) meninges.
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Jeremy leads an active lifestyle. He spends at least two hours in the gym every day. He follows a high protein diet and consumes caffeine in moderate quantities. Despite this, Jeremy falls asleep at his desk four to five times a day. Once he wakes up, he finds it difficult to move around for a few minutes. He likely has
A) anorexia nervosa. B) bulimia. C) schizophrenia. D) narcolepsy.
The key difference between incomplete dominance and codominance is
a. with incomplete dominance, the recessive allele cannot be detected; in codominance, the expression of the recessive allele is apparent. b. with incomplete dominance it is possible to detect the expression of a recessive allele; in codominance, both alleles contribute equally to the phenotype. c. with codominance it is possible to detect the expression of a recessive allele; in incomplete dominance, both alleles contribute equally to the phenotype. d. with incomplete dominance, it is possible to detect the expression of the dominant allele; in codominance, both alleles contribute equally to the phenotype. e. the two terms mean the same thing.
The accompanying figure is the product of a:
a. phase-contrast light microscope.
b. Nomarski differential interference microscope.
c. transmission electron microscope.
d. scanning electron microscope.
e. confocal fluorescence microscope.
Cytotoxic T-cells attack:
a) Host cells infected with bacteria b) Transplanted tissue cells from another host c) Cancer cells d) Two of the above are true e) All of the above are true