________ occurs when an external signal does NOT directly enter the cell but instead is detected by a sensor that transmits it to the rest of the regulatory machinery
a. Quorum sensing
b. Sensory transduction
c. Signal transduction
d. Two-component regulation
Answer: C
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An atom that is negatively charged because it has accepted an electron is a(n):
A. isotope. B. isomer. C. ion. D. monomer.
Spinal reflexes do not involve
a. afferent nerves. b. efferent nerves. c. interneurons. d. the spinal cord. e. the brain.
It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in which of the following?
A) sequence of bases B) phosphate-sugar backbones C) complementary pairing of bases D) side groups of nitrogenous bases
Gram ________ bacteria stain purple and have a very simple cell wall, only consisting of peptidylglycan:
A. Positive B. Negative