A well-tested hypothesis that has not been disproved
is called a
a. principle.
b. law.
c. theory.
d. fact.
e. hypothesis.
Answer: c
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Chromatin remodeling can act as an on/off switch for ________, while microRNA binding can block ________.
A) transcription; translation B) translation; transcription C) synthesis of tRNAs; synthesis of rRNAs D) DNA replication; DNA repair
Small polar and charged molecules typically cross the cell membrane by way of ____
a. simple diffusion b. osmosis c. filtration d. active transport e. facilitated diffusion
Carotenoids are often found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants?
A) They serve as accessory pigments to increase light absorption. B) They protect against oxidative damage from excessive light energy. C) They shield the sensitive chromosomes of the plant from harmful ultraviolet radiation. D) They reflect orange light and enhance red light absorption by chlorophyll.
How can you tell the difference between the sound of a tuba and that of a flute?
A. Each part of the spiral organ is sensitive to different wave frequencies. B. Lower pitches activate all three bones of the middle ear, while higher pitches only activate one or two. C. The cochlear nerve fires more frequently for higher pitches and less frequently for lower pitches. D. The brain interprets pitches based on the strength of the sound waves. E. Lower pitches cause the tympanic membrane to vibrate, while higher pitches vibrate the vestibular canal.