Dilation of blood vessels in extremities can help animals lose excess heat as part of thermoregulation.
a. true
b. false
a. true
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In the electron transport chain, why do electrons flow in one direction from NADH to O2 rather than the reverse direction, or randomly?
A. Electrons flow from NADH to O2 because NADH has the most negative reduction potential and O2 the most positive with electron carriers in between, each becoming more positive to direct the electron flow. B. Electrons flow from NADH to O2 using ATP as a source of energy to drive the flow against their gradient from most negative reduction potential to most positive. C. Electrons flow from NADH to O2 because the change in free energy directs the electron flow from the molecule with the most positive reduction potential to the one with the most negative. D. Electrons flow from NADH to O2 because NADH has the most positive reduction potential and O2 the most negative with electron carriers in between, each becoming more negative to direct the electron flow.
Groups of bacteria living together in a close knit
group are also known as a. eukaryotes. b. all pathogenic bacteria. c. monophylogenic cultures. d. biofilms. e. all of these.
You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see cell walls and membrane-bound organelles. You conclude correctly that the cells
A) are plant cells. B) are animal cells. C) are bacterial cells. D) could be either plant or bacterial cells.
Vesicles that bud off the ER are typically shuttled to the ________ where their contents can be modified, sorted, and distributed
A) plasma membrane B) lysosome C) nucleus D) Golgi apparatus E) mitochondria