BS 161 EXAM 2 NEWEST EXAM COMPLETE 200 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+.pdf

BS 161 EXAM 2 NEWEST EXAM COMPLETE 2
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024 QUESTIONS AND CORRECT DETAILED A
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NSWERS (VERIFIED ANSWERS) ALREADY G n n n n



RADED A+. n




Which of the following is least likely to cross a lipid bilayer with n
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o proteins?
n


a steroid hormone such as testosterone CO2
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H2O
ATP
n


O2 - ANSWER >>>>ATP
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Which one of the following describes the hydrophilic componen
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t of cholesterol?
n n




a phosphate group only a
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n hydroxyl group only n n




a single hydrocarbon tail
n n n




a phosphate group and a chemical group called choline
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a group of four planar rings and a hydroxyl group - ANSWER
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>>>>a hydroxyl group only n n n




For translation to occur in eukaryotes, mRNA molecules must b
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e transported through which membrane(s)?
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,nuclear envelope (inner and outer nuclear membranes) mitoch
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ondrial membrane (inner and outer) n n n n




plasma membrane n




endoplasmic reticulum membrane n n




ribosome membrane - ANSWER >>>> n n n n




In intestinal epithelial cells, a transport protein moves glucose in
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to the cytoplasm against its concentration gradient at the same t
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ime that it transports Na+ into the cell down its electrochemical
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gradient. Which of the following CORRECTLY describes this co
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transport of glucose and sodium? n n n n




Energy from ATP directly drives the movement of glucose
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No energy source is required for glucose to move against its con
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centration gradient n




Na+ can move by simple diffusion, but glucose transport requir
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es a carrier protein
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The Na+ concentration gradient provides the energy for glucos
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e transport -
n n


ANSWER >>>>The Na+ concentration gradient provides the e
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nergy for glucose transport n n n




The lipid components of cellular membranes often include: fatty
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n acids and cholesterol. n n

,phospholipids and fatty acids. phospholipids n n n n n




and cholesterol. n




phospholipids - ANSWER >>>>phospholipids and cholesterol. n n n n n




In response to seasonal changes in temperature, many organis
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ms must alter the composition of their plasma membranes to m
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aintain the proper degree of fluidity. As summer turns to fall and
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eventually into winter, which of the following would you predict y
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ou would observe in the plasma membranes of organisms that
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are unable to regulate their body temperature?
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a decrease in phospholipid fatty acid side chain length and an incr
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ease in side chain saturation
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an increase in phospholipid fatty acid side chain length and an incr
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ease in side chain saturation
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a decrease in phospholipid fatty acid side chain length and a de
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crease in side chain saturation n n n n




an increase in phospholipid fatty acid side chain length and a de
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crease in side chain saturation - n n n n n


nANSWER >>>>a decrease in phospholipid fatty acid side chain
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length and a decrease in side chain saturation
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Which component of a phospholipid is found in the interior of a li
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pid bilayer? n




fatty acids n

, glycerol
phosphate group - ANSWER >>>>fatty acids n n n n n




Suppose you are studying the transport of a certain polar molec
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ule across the plasma membrane of cells in culture. Over a peri
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od of time, you measure the concentration of a polar molecule in
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side and outside of the cells. You find that the concentration of t
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he molecule is lower in the cell but is gradually increasing. You a
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lso measure the ATP concentration inside the cell and find that it
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nis not changing. Which of the following is probably responsible f
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or the transport of this polar substance into the cell?
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endocytosis


simple diffusion ac n n




tive transport n




secondary active transport n n




facilitated diffusion - ANSWER >>>>Facilitated diffusion
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Which of the following represents the order that molecules cros
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s a synthetic membrane composed of phospholipids but not pro
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teins, from most easily (freely permeable) to least easily (not pe
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rmeable)?

O2, sodium ions (Na+), water (H2O), glucose O2,
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water (H2O), glucose, sodium ions (Na+)
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