________ causes the formation fibrin blood clots, whereas ________ breaks down these clots down
What will be an ideal response?
coagulase; kinase
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Which of the following is not largely secreted
by the gonads? a. estrogen. b. testosterone. c. progesterone. d. all of these. e. none of these
Which of these is a niche that Cambrian animals occupied?that, as far as we know, their predecessors did not?
A) grazing on microbial mats B) feeding on organic debris C) absorbing nutrients across membranes D) predation while actively swimming E) None of the above.
Which of the following is recommended for diabetes mellitus patients?
A) smoking B) binge drinking C) inactivity D) controlling stress
Which of the following is (are) NOT characteristic(s) of the pathways activated by second messengers?
a) Each signaling pathway consists of a series of distinct proteins that operate in sequence. b) Some phosphatases and protein kinases in the pathway have numerous proteins as their substrates; others act on only a single protein substrate or a single amino acid of a protein substrate. c) Alterations in the conformations of signaling proteins are often accomplished by protein kinases and protein phosphatases that, respectively, add or remove phosphate groups from other proteins. d) Each protein in the pathway typically acts by altering the conformation of the previous (upstream) protein in the series, an event that activates or inhibits the protein.