You have recently identified a molecule you believe to be a signal molecule associated with signal
transduction. All you know about this signal molecule is that chemically it is hydrophilic. As a result
you expect it to interact with ____.
a. a receptor on the cell surface
b. a receptor within the cytoplasm of the cell
c. a receptor in the nucleus of the cell
d. a receptor on the cytoplasmic surface of the plasma membrane
e. a receptor associated with the endoplasmic reticulum
A
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_____ refers to a system in which individuals select their mates according to phenotype
A. Assortative mating B. Random mating C. Differential mating D. Sexual selection E. All of these
Approximately 65.5 million years ago the Earth experienced a permanent loss of major groups of organisms during an event called ________
a. speciation b. continental drift c. genetic equilibrium d. mass extinction e. directional selection
What is a gene?
A. A section of DNA that codes for a portion of a protein B. A discrete sequence of DNA nucleotides C. A section of DNA that codes for one or more proteins D. All of these and more are part of the expanding definition of a gene.
Blood flow velocity is inversely proportional to the pooled surface area of a structure; therefore, it is greatest in the ________ and slowest in the ________.
A) capillaries : arteries B) arteries : capillaries C) veins : arteries D) arteries : veins E) arterioles : veins