Mutations are permanent alterations in which of the following?
A) tRNA
B) DNA
C) mRNA
D) snRNA
E) ribosomes
B) DNA
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Which type of curvature is normal for the lumbar region?
A. scoliosis B. kyphosis C. lordosis D. None of the above
A receptor cell
a. is involved in converting stimulus energy into action potentials. b. is specialized to respond to a particular sensory modality. c. can often be found in a sense organ grouped with other cells responsive to the same adequate stimulus. d. all of these. e. none of these.
Water-soluble hormones, such as proteins and peptide hormones, activate target cells using ________
A) direct gene activation B) the second-messenger system C) steroid hormone action D) diffusion
A feeling that it is necessary to void, which is experienced more regularly in the elderly, is known as ________
A) urgency B) nocturia C) frequency D) urethritis