A flagellated protist lives inside the guts of termites and enables the termites to digest the cellulose in wood as a food source. This protist belongs to the
A) ciliates.
B) parabasalids.
C) amoebas.
D) apicomplexans.
E) Archaea.
B
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Regulatory proteins bind to the ____ of a gene operon
a. transcription unit only b. promoter only c. operator only d. transcription unit and promoter e. operator and promoter
Predict how the plasma membrane fatty acid composition would change as the temperature of the habitat of an aquatic bacterial species warms from 2oC to 15oC during the spring and summer months.
A. The percentage of saturated fatty acids would decrease. B. The percentage of saturated fatty acids would remain unchanged. C. The percentage of saturated fatty acids would increase. D. The percentage of unsaturated fatty acids would increase.
You are seeking a new anti-inflammatory drug to inhibit local responses to stress and injury. Which of the following activities would you look for in a potential anti-inflammatory agent?
A) stimulates release of prostaglandins B) blocks adenylate cyclase activity C) blocks an enzyme associated with arachidonic acid production D) stimulates the activation of platelets E) increases estrogen secretion
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