A genetic trait controlled by one set of alleles on a gene is termed a:
A) single-gene disorder
B) dual-allele disorder
C) single chromosome disorder
D) none of the above
Ans: A) single-gene disorder
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The osmotic pressure exerted by a cell would decrease if the cell synthesized more proteins.
Answer the following statement true (T) or false (F)
Which of the following situations occurs in electrically excitable cells?
A. Ligand-gated Na+ channels are opened by high extracellular Ca2+ levels. B. When Na+ channels open, K+ channels close. C. Proteins tend to diffuse out of the cell. D. The sodium-potassium pump moves Na+ into the cell. E. Depolarization causes voltage-gated Na+ channels to open.
Articulations permitting only slight degrees of movement are ________.
A) amphiarthroses B) synarthroses C) diarthroses D) synovial joints
Structure D is a(n)
A) endocrine gland.
B) sebaceous gland.
C) merocrine gland.
D) apocrine gland.
E) unicellular gland.