Significant in the deciphering of the genetic code was the discovery of the enzyme polynucleotide phosphorylase. What is this enzyme used for?
A) manufacture of synthetic RNA for cell-free systems
B) degradation of RNA
C) ribosomal translocation
D) peptide bond formation
E) production of ribosomal proteins
A
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Light-dependent reactions generate
A. ATP and NADPH. B. NADP+. C. CO2. D. light. E. glucose.
Which characteristic of birds is essential to their ability to fly?
a. pneumatic bones b. cutaneous respiration c. a lateral line d. mammalian lungs
What event triggers the release of neurotransmitters?
a. Calcium induces the fusion of synaptic vesicles with the presynaptic membrane. b. Sodium induces the fusion of synaptic vesicles with the presynaptic membrane. c. Potassium induces the fusion of synaptic vesicles with the presynaptic membrane. d. Calcium activates enzymes that degrade synaptic vesicles. e. Sodium activates enzymes that degrade synaptic vesicles.
Urine flows from the ureters directly into the urethra. Indicate whether the statement is true or false