Lecture Exam 1 (A)

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  Acting as an agonist on the receptor for epinephrine, a hormone that increases heart contractility

B  Increasing the expression of cAMP

C  Decreasing the activity of cAMP-dependent protein kinase

D  Inhibiting phosphodiesterase activity

E  Increasing the availability of phosphodiesterase molecules

A  Decreased expression of the second messenger in the insulin pathway

B  Upregulation of insulin receptors

C  Saturation of the insulin receptor

D  Downregulation of insulin receptors

E  Increased affinity of insulin for its receptor

A  cAMP

B  G-protein coupled receptor

C  Tyrosine residues

D  Enzymes

A  FALSE

B  TRUE

A  is an agonist to the enkephalin receptor.

B  decreases enkephalin in the brain

C  increases enkephalin in the brain.

D  increases enkephalin’s affinity for its receptor.

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  The activated receptor complex stimulates production of two different second messengers.

B  Cyclic AMP-dependent protein kinase activates two kinds of enzymes.

C  Cyclic AMP directly activates enzymes that catabolize glycogen and fat.

D  Epinephrine is binding to two types of receptors in the plasma membrane.

A  allows small amounts of hormones to produce large responses in target cells.

B  takes small molecules and makes polymers out of them.

C  allows a cell to respond to more different hormones.

D  results in the production of more of the first messenger.

A  Adenylyl cyclase

B  Diacylglycerol

C  ATP

D  Epinephrine

E  Phospholipase C

A  FALSE

B  TRUE

A  Epithelial cells lining the small intestine have Na +-K +-ATPase pumps only in their basolateral membranes.

B  When substances cross epithelial barriers by going through the cell membranes and cytosol, it is called the transcellular pathway.

C  The pathway taken by substances that flow between epithelial cells is called the paracellular pathway.

D  Epithelial cell membranes express different transport proteins on different cell surfaces.

E  The plasma membrane of epithelial cells that face the inside of a hollow or fluid-filled chamber in the body is called the basolateral membrane.

A  TRUE

B  FALSE

A  FALSE

B  TRUE

A  false, because nonpolar molecules diffuse through more rapidly because much of the bilayer is nonpolar.

B  false, because polar molecules diffuse through less rapidly because the bilayer is polar throughout its width.

C  true.

D  false, because the rate of diffusion of nonpolar and polar molecules through the bilayer is essentially the same as long as the molecules are the same size.

E  false, because polar molecules diffuse through less rapidly because the bilayer is nonpolar throughout its width.

A  Secondary active transport of molecules would cease

B  Primary active transport of molecules would cease.

C  Ion concentration gradients would reach equilibrium across the cell membrane.

D  All transport processes would cease immediately when the ATP was depleted.

E  Facilitated diffusion of molecules would cease.

A  diffusion.

B  apoptosis.

C  facilitated diffusion.

D  endocytosis.

E  osmosis.

A  TRUE

B  FALSE

A  At equilibrium, X will cease movingacross the cell membrane.

B  At equilibrium, the netflux of X across the cell membrane is zero.

C  Solute X will be unable to reach equilibrium because it is nonpolar.

D  At equilibrium, movement of X across the membrane will be much faster in one direction than in the other.

E  Solute X will reach equilibrium, but the concentration will be much higher on the inside of the cell because of the smaller volume.

A  Its nonpenetrating solute concentration is less than that of a normalcell

B  Its penetrating solute concentration is less than that of a normalcell.

C  Its nonpenetrating solute concentration is greater than that of a normalcell.

D  Its penetrating solute concentration is greater than that of a normalcell

E  Its nonpenetrating solute concentration is equal to that of a normalcell.

A  The reaction is catabolic and the energy content of the reactant is greater than that of the products.

B  The reaction is catabolic and the energy content of the products is greater than that of the reactant.

C  The reaction is catabolic and the energy content of the products are equal to that of the reactant.

D  The reaction is anabolic and the energy content of the reactant is greater than that of the products.

E  The reaction is anabolic and the energy content of the products is greater than that of the reactant.

A  TRUE

B  FALSE

A  The reverse direction (toward more water and carbon dioxide accumulation)

B  The forward direction (toward more carbonic acid accumulation)

C  The net rate will be unaffected by an increase in carbonic acid concentration.

A  The enzyme has become saturated.

B  The temperature of the room needs to increase to increase the rate of reaction.

C  The substrate solution has become contaminated with an allosteric inhibitor.

D  Over time, the substrate molecules are denaturing.

E  The enzyme molecules are being used up and broken down by the reaction.

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  endosomes

B  peroxisomes

C  lysosomes

D  mitochondria

E  ribosomes

A  The breakdown of fatty acids to CO 2 and H 2O

B  Krebs cycle

C  Glycolysis

D  Oxidative phosphorylation

E  None of the choices are correct.

A  TRUE

B  FALSE

A  Digestion of engulfed bacteria and cellular debris

B  Synthesis of lipids and intracellular storage of calcium ions

C  Generation of ATP

D  Transcription of DNA into RNA

E  Synthesis and packaging of proteins for secretion from the cell or export to other organelles

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  Free radicals

B  Isotopes

C  Gasses

D  Electrolytes

E  Vitamins

A  TRUE

B  FALSE

A  Carbon and hydrogen, connected by ionic bonds

B  Carbon and hydrogen, connected by non-polar covalent bonds

C  Carbon and oxygen, connected by polar covalent bonds.

D  Oxygen and hydrogen, connected by hydrogen bonds

E  Carbon and hydrogen, connected by hydrogen bonds

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  Vitamins

B  Lipids that form the membranes of cells

C  Sugars that were broken down for energy

D  Oxygen and gases used by metabolism

E  Ionic forms of mineral elements

A  They have different numbers of protons.

B  They have different numbers of electrons.

C  They have different numbers of neutrons.

D  They can form different numbers of chemical bonds.

E  They have different number of energy shells

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  They are polymers of subunits containing glucose, a phosphate group, and an amino acid.

B  They are polymers of subunits containing glucose andamino acids.

C  They are long polymers of amino acids, folded into an alpha helix.

D  They are polymers of subunits containing a phosphate group, a sugar, and a purine or pyrimidine base.

E  They are polymers of subunits containing a phosphate group, a sugar, and an amino acid.

A  FALSE

B  TRUE

A  Change the set point for sodium

B  Increase the amount of sodium in the blood

C  Inhibit the ingestion of more sodium

D  Decrease the amount of sodium in the blood

E  Leave the amount of sodium unchanged

A  Suprachiasmatic nucleus of the brain

B  Endocrine gland in the gonads

C  Ventricles of the heart

D  Photoreceptors of the eye

E  The adrenal glands

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  Receptor, efferent pathway, integrating center, afferent pathway, effector

B  Effector, efferent pathway, integrating center, afferent pathway, receptor

C  Effector, afferent pathway, integrating center, efferent pathway, receptor

D  Receptor, afferent pathway, integrating center, efferent pathway, effector

E  Integrating center, receptor, afferent pathway, efferent pathway, effector

A  FALSE

B  TRUE

A  two of the choices are correct.

B  how two organisms interact.

C  the spread of diseases.

D  the structure of the body.

E  how organisms function.