Two species have homologous structures. What can we infer?
a. The structures are identical.
b. The structures have the same function.
c. The species have very different ancestors.
d. The species are related by a common ancestry.
e. The structures have the same function and they are identical.
d
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Consider the metabolic repertoire of prokaryotes and the diverse environments in which they can thrive to answer the following questions. Respiration is strictly an aerobic process
A. true B. false
Plastocyanin (PC)
A) is a mobile electron carrier. B) is also called plastoquinol. C) carries only a single electron at a time. D) both choices A and C E) choices A, B, and C
The cell junction labeled “C” in the figure
a. prevents movement of materials between cells. b. is found in tissues subjected to stretching. c. anchors cells to each other and to the intracellular matrix. d. is found abundantly in surface epithelia. e. is found in most tissues except heart muscle.
In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. Direct contact B. Synaptic C. Paracrine D. Endocrine E. Autocrine