Without performing any calculations, which of the following is the gene order?
A) abc
B) acb
C) cab
D) +++
E) None of these
B
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Lateral inhibition via amacrine cells in the mammalian retina _____
A) underlies habituation of vision B) enhances visual contrast C) prevents bleaching in bright light D) is required for color vision to occur E) recycles neurotransmitter molecules
The first O2 producing organisms were probably
a. cyanobacteria. b. Archaea. c. green algae. d. red algae. e. plants.
Why is PCR useful?
A) It allows fragments of DNA to be separated by size. B) It is essential for making many copies of a transgenic animal. C) It allows for making many copies of DNA when the starting sample is small. D) It is required for the introduction of DNA into reproductively cloned animals.
Place the events in the transmission of an action potential in the correct order:1. An action potential begins in the receiving neuron. 2. Neurotransmitters are released into the synaptic cleft. 3. An action potential arrives at an axon terminal. 4. Calcium ions enter the axon terminal.5. Sodium ions diffuse into the receiving neuron.6. Synaptic vesicles fuse with the plasma membrane.7. Neurotransmitter molecules bind to the membrane of the receiving neuron.
A. 3,4,6,2,7,5,1 B. 7,6,5,3,4,2,1 C. 3,5,6,2,7,4,1 D. 2,3,6,7,4,5,1 E. 1,2,6,7,4,3,5