BIOS 1404 exam 2 Jaffe

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BIOS 1404 exam 2 Jaffe

• Large numbers of ribosomes are present in cells that specialize in produc- ing which of the

following molecules?–Answer Proteins

• Cells require which of the following to form cilia or flagella?

–Answer Intermediate filaments

• GTPase activity is important in the regulation of signal transduction be- cause it

–Answer Converts cGMP to GTP

• Which f the following statements is correct about diffusion ?

–Answer It is a passive process in which molecules move from a region of higher concentration to a region of lower concertration

• Thylakoids, DNA, and ribosomes are all components found in

–Answer Mitochondria

• Which of the following us true of enzymes ?

–Answer Enzymes increase the rate of chemical reaction by providing activation energy to the substrate

• Which of the following is characterized by a cell releasing a signal molecule into the

environment, followed by a number of cells in the immediate vicinity responding?–Answer Autocrine signaling

• Which of the following is true of transcription factors?

–Answer They transcribe ATP into cAMP 1 / 2

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• Which curve(s) on the graphs may represent the temperature and pH pro- files of an enzyme

taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70°C or higher?–Answer Curves 3 and 4

• The extracellular matrix is thought to participate in the regulation of animal cell behavior by

communicating information from the outside to the inside of the cell via which of the following?–Answer Integrins .

• Which of the following represents the ”G of the reaction in the figure above?

–Answer A

• Which of the following types of molecules are the major structural compo- nents of the cell

membrane?–Answer Phospholipids and cellulose

• Glucose cannot diffuse through artificial phospholipid bilayers. The cells lining the small

intestine, however rapidly move large quantities of glucoses from the extracellular space into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?–Answer Paracrine transporrt

• Which of the following is the greatest advantage of having multiple steps in a transduction

pathway?–Answer Having multiple steps in a pathway requires the least amount of ATP

• When protein membrane receptors are activated, what usually happens?-

–Answer A change occurs in intracellular ion concentration

• Which of the following is a reasonable explanation for why unsaturated fatty acids help
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