Which type of transmembrane protein is directly responsible for maintaining the propagation of action potentials across an axon once it has been initiated?
A) Sodium-potassium pumps
B) Voltage-gated potassium channels
C) Voltage-gated sodium channels
D) Voltage-gated calcium channels
E) Ligand-gated ion channels
Answer: C) Voltage-gated sodium channels
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What are flowers that contain both stamens and carpels?
a. synergids b. dioecious c. perfect flowers d. epizoochorous
DNA replaced RNA as the main information
molecule probably because a. DNA contains thymine and RNA does not. b. DNA is double stranded and breaks less easily. c. DNA can store more protein-building instructions in less space. d. RNA is highly unstable. e. two of these are correct
Somatic pain is sensed in all of the following EXCEPT
a. skin. b. skeletal muscles. c. joints. d. tendons. e. visceral organs.
Transduction
A) is the direct transfer of DNA from one bacterium to another. B) occurs when a bacterium acquires DNA from the surrounding environment. C) occurs when a phage transfers bacterial DNA from one bacterium to another. D) requires DNA polymerase.