The most frequent way in which regulatory RNA molecules exert their effects is by
A) base pairing with other RNA molecules that have regions of complementary sequence.
B) binding to a repressor and repressing enzyme transcription.
C) acting as an inducer that then binds to an activator protein to allow transcription to proceed.
D) signal transduction.
Answer: A
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According to the first law of thermodynamics, ____
a. the energy of a system always increases b. the amount of energy in the universe is changeable c. chemical reactions do not create or destroy energy d. energy is always stable e. energy always decreases
What would a scientist see when looking through a microscope at a piece of shoulder muscle?
A. striations with branched fibers B. no striations and unbranched fibers C. no striations and branched fibers D. striations with unbranched fibers E. None of the answers are correct.
Which one of the following statements is TRUE regarding fibrous joints?
A) They are freely movable and can bend and rotate. B) The bones are separated by a fluid-filled cavity that lubricates the joint. C) Fibrous joints present at birth between bones of the skull develop into sutures in the adult. D) The bones are held together by cartilage and tendons. E) They include hinge joints and ball-and-socket joints.
Amino acids are linked together by peptide bonds in a ____
A. starch. B. polypeptide. C. polysaccharide. D. nucleic acid. E. phospholipid.