CH 7 - MULTIPLE CHOICE. Choose the one alternative that...

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1)The advantage of light microscopy over electron microscopy is that 1) _______ A)light microscopy allows one to view dynamic processes in living cells. B)light microscopy provides for higher resolving power than electron microscopy. C)light microscopy provides for higher magnification than electron microscopy. D)A and B E)B and C 2)Which of the following types of molecules are the major structural components of the cell membrane? 2) _______ A)nucleic acids and proteins B)phospholipids and proteins C)proteins and cellulose D)phospholipids and cellulose E)glycoproteins and cholesterol 3)Which of the following is true of the mating signal transduction pathway in yeast? 3) _______ A)Mating type a secretes a signal called a factor. B)The pathway carries an electrical signal between mating cell types. C)The molecular details of the pathway in yeast and in animals are very different. D)Scientists think the pathway evolved long after multicellular creatures appeared on Earth. E)The signal reception, transduction, and response occur in the nucleus. 4)From the perspective of the cell receiving the message, the three stages of cell signaling are 4) _______ A)signal reception, signal transduction, and cellular response. B)the paracrine, local, and synaptic stages. C)signal reception, cellular response, and cell division. D)the alpha, beta, and gamma stages. E)signal reception, nucleus disintegration, and new cell generation. 5)The process of transduction usually begins 5) _______ A)when the chemical signal is released from the alpha cell. B)after the target cell divides. C)when the signal molecule changes the receptor protein in some way. D)when the hormone is released from the gland into the blood. E)after the third stage of cell signaling is completed. 6)A small molecule that specifically binds to another molecule, usually a larger one 6) _______ A)is called a signal transducer. B)seldom is involved in hormonal signaling. C)is called a ligand. D)usually terminates a signal reception. E)is called a polymer.
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7)Up to 60% of all medicines used today exert their effects by influencing what structures in the cell membrane? 7) _______ A)growth factors B)G proteins C)cholesterol D)tyrosine-kinases receptors E)ligand-gated ion channel receptors 8)Testosterone functions inside a cell by 8) _______ A)coordinating a phosphorylation cascade that increases glycogen metabolism. B)becoming a second messenger that inhibits adenylyl cyclase. C)binding with a receptor protein that enters the nucleus and activates specific genes. D)acting as a signal receptor that activates ion-channel proteins.
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This note was uploaded on 03/18/2012 for the course BI, HEALTH 251 taught by Professor N/a during the Spring '12 term at MD University College.

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CH 7 - MULTIPLE CHOICE. Choose the one alternative that...

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