You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a
A. protein.
B. lipid.
C. DNA.
D. carbohydrate.
Answer: C
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Natural selection exerts little or no effect on traits that appear during an individual’s ____
a. preadolescent years b. embryonic development c. juvenile phase d. postreproductive life e. reproductive life
What is the term for when the fluid inside and outside of a cell has the same osmolarity?
a. Hypotonic b. Isotonic c. Hypertonic d. Catatonic
The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes. What is this organelle called?
A. zona pellucida B. acrosome C. granulosa D. blastula E. neural cap
The sliding filament model
a. supplies the energy needed for muscle contraction. b. provides a flexing action for the muscle fibers. c. describes the action of the actin and myosin in a muscle cell. d. explains muscle fatigue. e. only explains how muscles contract, not how they relax.