Steroid hormones can diffuse into all cells of the body; however, not all cells respond to steroid hormones. Why?
A) Not all cells contain the genes necessary to respond to steroid hormones.
B) Only cells displaying plasma membrane receptors can respond to a lipid-soluble hormone.
C) Not all cells are lipid soluble and therefore they cannot respond to steroid hormones.
D) Only cells containing cytoplasmic or nuclear receptors to the steroid hormone can respond.
E) Only cells with surface protein receptors can respond to steroid hormones.
D
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Clinical sensitivity in the microbiology laboratory refers to:
a. positive results from patients known to have an infection or disease. b. percentage of positive results from all pa-tients tested. c. percentage of patient's that test negative known to have an infection or disease. d. none of the above answers are correct.
The most likely identification of an anaerobic gram-negative bacilli that will fluoresce brick red or has a brown-to-black-pigment is:
a. nonpigmented Prevotella. b. Porphyromonas spp. c. B. fragilis group. d. Fusobacterium spp.
Neuropeptide neurotransmitters ____
a. can act as direct neurotransmitters between neurons and muscle cells b. can act as postsynaptic membrane inhibitors c. directly open K+ channels to inhibit neurons d. can act as pain reducers and initiate euphoria e. directly inhibit euphoria
The field of genetics includes
A) the study of heredity. B) the molecular nature of the genetic material. C) the ways in which genes control life functions. D) the distribution and behavior of genes in populations. E) All of these