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

Biology & Microbiology

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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

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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.

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Blood flow velocity is inversely proportional to the pooled surface area of a structure; therefore, it is greatest in the ________ and slowest in the ________.

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