Answer the following statements true (T) or false (F)
1. You could observe saltatory conduction in a crayfish.
2. The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels.
3. Electrical synapses transmit signals using neurotransmitters.
4. A given neurotransmitter can produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
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What is production efficiency?
A. The rate of photosynthetic fixation as a function of temperature. B. The percentage of energy assimilated by an organism that becomes new biomass. C. The amount of energy used by organisms at every node of a food web. D. Consumption of primary production by the second and third levels of a food web. E. The net gain to an ecosystem based on photosynthetic production.
What is a major benefit of CRISRPR-Cas9 over older gene therapy tools?
A) It delivers a gene to a specific part of the genome. B) It can be used in vivo. C) It is the only tool that can delivery genes safely in humans. D) It can also be used to deliver proteins.
At what checkpoint(s) does the cell arrest in response to DNA damage?
A. spindle B. G1/S C. G1/S and G2/M D. G2/M and spindle E. G2/M
The primary function of molecular membranes is the transport of ions and molecules in and out of cells. The movement of molecules from areas of low concentration to those of high concentration against chemical gradients is best described as:
A) passive transport. B) osmosis. C) active transport. D) channel-mediated diffusion. E) electron transport.