FREE AND STUDY GAMES ABOUT BIOCHEM EXAM 3

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FREE AND STUDY GAMES ABOUT BIOCHEM EXAM 3

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -102 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Associations of proteins with membranes that do NOT exist are:

Answer:

integral membrane-spanning ? helices with polar side groups outside.Question 2: Which role does the membrane play by separating the cell interior from the exterior and cell compartments from the cell interior?

Answer:

an interface Question 3: the common feature of all ?-3 fatty acids is/are:?

Answer:

several double bonds in the chain Question 4: How would the action potential on a neuron in the resting state change if all of the sodium ion channels were blocked?

Answer:

action potential wouldn't be generated or propagated

Question 5: What are derived from the treatment of triacylglycerols with strong bases?

Answer:

salts of fatty acids Question 6: Which component of membranes is key to controlling membrane fluidity in prokaryotes?

Answer:

hydrophobic tails of phospholipids Question 7: . If you want to study how membranes regulate their curvature and budding processes, what membrane structures would you study?

Answer:

presence of lipid rafts

Question 8: Why is gluconeogenesis not a reversal of glycolysis?

Answer:

. Glycolysis comprises irreversible steps which are bypassed in gluconeogenesis by gluconeogenic enzymes.Question 9: . Which fact about a fatty acid is indicated by the notation 12:2?

Answer:

There are 12 carbons in the chain with two double bonds.Question 10: An antiporter and a symporter are examples of:

Answer:

a secondary transporter Question 11: What would happen to the neuron if the Na+-K+ ATPase activity would be completely inhibited?

Answer:

The resting potential wouldn't be restored after the action potential.

Question 12: Which statement is consistent with the structure of biological membranes?

Answer:

The membrane lipids self-assemble to form the lipid bilayer.Question 13: Lipid rafts:

Answer:

are small and dynamic regions rich in cholesterol that make phase transitions of the membrane less likely Question 14: Fluorescence recovery after photobleaching has been used to study:

Answer:

lateral diffusion in membranes.

Question 15: what is an alcohol component in cerebroside?

Answer:

sphingosine Question 16: Taking into account the daily glucose requirement in a typical adult human being, calculate the weekly requirement for the whole body.

Answer:

1120g

Question 17: . What role do van der Waals interactions play in membranes?

Answer:

. decrease membrane fluidity Question 18: . Would you agree that a peripheral membrane protein can act as Na+-K+ ATPase?Why?

Answer:

. No, because a peripheral protein does not form a transporter across the entire membrane Question 19: The GPI anchor does NOT contain a(n):

Answer:

cyclopentane ring

Question 20: . Which component of membranes provides their impermeability to polar molecules and ions?

Answer:

. hydrophobic tails of phospholipids Question 21: What type of transport can proceed against a concentration gradient?

Answer:

active transport Question 22: Derivatives of cholesterol with an alcohol functional group are:

Answer:

sterols

Question 23: Choose the CORRECT statement about membrane permeability.

Answer:

Entry of sodium ions in the cell can increase membrane permeability for sodium ions.

Question 24: What is the first step of the action potential?

Answer:

The flow of Na+out of the cell

Question 25: What is the main storage form of fatty acids?

Answer:

triacylglycerols Question 26: Choose the denotation for the double bond position and conformation in natural oleic acid?

Answer:

cis-?^9

Question 27: What are the consequences of biotin deficiency?

Answer:

lethargy and depression