Choose from the following terms to fill in the blanks in the correct order
A. ligand
B. signaling cell
C. receptor
D. responding cell
In communication between cells, the _____________________ produces the signaling
molecule, also known as the ________________; the ______________________ produces
the _______________, to which the signaling molecule binds.
A. B, A, D, C
B. A, B, C, D
C. B, C, A, D
D. D, C, B, A
A
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When researchers calibrate the molecular clock they are
A. determining how much time it takes to accumulate a certain percentage of nucleotide changes. B. setting the geological time scale according to the position in which the fossil was found in the rock. C. investigating where the least common ancestor was found. D. generalizing about the amount of time between speciations. E. setting the geological time scale according to the position in which the fossil was found in the rock and investigating where the least common ancestor was found.
All of the following are stages of aerobic cellular respiration EXCEPT
a. glycolysis. b. the citric acid cycle. c. the electron transport chain. d. acetyl CoA
A milkweed plant discourages consumption by herbivores by ____
a. exuding a toxic sap b. developing an appearance that mimics an undesirable plant c. having hairy leaves d. producing an undesirable scent e. having thorns
Which of the following is a non-protein carrier found in some electron transport chains?
A. flavoproteins B. metal-containing proteins C. ribozymes D. cytochromes E. ubiquinone