For mechanisms of sex determination, which of the following is incorrectly paired?
A. X-Y, cow
B. X-O, grasshopper
C. ZZ-ZW, bluebird
D. 1n-2n, pea plant
E. high temperature-low temperature, alligator
D. 1n-2n, pea plant
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Some archaea have unique phospholipids in their cytoplasmic membrane that
A) form a monolayer due to the presence of diglycerol tetraethers. B) form a bilayer due to the presence of sterols. C) form a stable ring structure due to the presence of crenarchaeol. D) form a bilayer due to the presence of phosphatidylethanolamine.
The basic unit of contraction in a skeletal muscle is the:
a. myofibril b. sarcomere c. muscle fiber d. myosin filament e. actin filament
When we watch Olympic athletes perform, we are admiring the expert control of which systems working together?
A. Nervous, muscular, and skeletal systems B. Muscular, integumentary, and circulatory systems C. Skeletal, endocrine, and circulatory systems D. Nervous, circulatory, and skeletal systems
A large molecule built of three to millions of subunits is a(n)
a. monomer. b. ion. c. polymer. d. enzyme. e. functional unit.