The research of which of the following scientists showed that genetic disorders and abnormal
metabolism are related?
A. Sir Archibald Garrod
B. Francis Crick
C. Linus Pauling
D. Linda Bartoshuk
E. James Neel
A
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Sertoli cells stimulate sperm production in response to:
A. testosterone and FSH. B. testosterone and LH. C. FSH and LH. D. GnRH and LH E. testosterone.
Enterococcus faecalis has been associated with ________.
A. diarrhea B. abscesses C. endocarditis D. sinus infection
Which of the following statements concerning phospholipids is FALSE?
a. They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic. b. They are amphipathic molecules. c. They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. d. They contain a polar organic group attached to a phosphate group. e. They contain three fatty acids chains.
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once
Cells signal to one another in various ways. Some use extracellular signal molecules that are dissolved gases, such as __________________, which can diffuse easily into cells. Others use cytokines, which bind to cytokine receptors. Cytokine receptors have no intrinsic enzyme activity but are associated with cytoplasmic tyrosine kinases called __________________s, which become activated on the binding of cytokine to its receptor and go on to phosphorylate and activate cytoplasmic transcriptional regulators called __________________s. Some intracellular signaling pathways involve chains of protein kinases that phosphorylate each other, as seen in the __________________ signaling module. Lipids can also relay signals in the cell, as we observe when phospholipase C cleaves the sugar-phosphate head off a lipid molecule to generate the two small messenger molecules __________________ (which remains embedded in the plasma membrane) and __________________ (which diffuses into the cytosol). cyclic GMP MAP kinase STAT diacylglycerol NO TGF? IP3 Ras JAK SMAD Fill in the blank(s) with correct word