Question

QUESTION 1

1. Which way do the fatty acid tails of a phospholipid face in a cell membrane?

   	a.	toward the inside of the cell
   	b.	toward the outside of the cell
   	c.	both directions
   	d.	They lay parallel to the direction of the membrane.

QUESTION 2

1. A readily available source of energy that cells use to drive reactions is stored in the ___________ bond.

   	a.	phosphodiester
   	b.	phosphoanhydride
   	c.	hydrogen
   	d.	peptide

QUESTION 3

1. Which of the following occurs by bringing nonpolar surfaces together to exclude water?

   	a.	hydrogen bonds
   	b.	hydrophobic forces
   	c.	Van der Waals attractions
   	d.	electrostatic attractions

QUESTION 4

1. How many bonds are made by a carbon atom?

   	a.	2
   	b.	3
   	c.	4
   	d.	1

QUESTION 5

1. Which of the following is an inorganic compound?

   	a.	table salt (e.g., NaCl)
   	b.	simple sugars (e.g., glucose)
   	c.	amino acids (e.g., phenylalanine)
   	d.	saturated fatty acids (e.g., palmitic acid)

QUESTION 6

1. The following image shows two triacylglycerol molecules with different fatty acid chains. If these fatty acids were in a phospholipid molecule, which of the two would form the most fluid membrane?
   
   
   

   	a.	saturated
   	b.	unsaturated
   	c.	Both would form very fluid membranes.
   	d.	Both would form very stiff membranes.

QUESTION 7

1. Ionic bonds are ___________ than covalent bonds and are ___________ common in cells.

   	a.	stronger; more
   	b.	stronger; less
   	c.	weaker; more
   	d.	weaker; less

QUESTION 8

1. Two atoms held together solely by ionic bonds are referred to as a(n)

   	a.	salt.
   	b.	molecule.
   	c.	element.
   	d.	isotope.

QUESTION 9

1. What is one of the main differences between DNA and RNA?

   	a.	DNA uses four different bases than RNA does.
   	b.	RNA has two hydroxyl groups on the sugar, DNA has one.
   	c.	DNA has three phosphate groups, RNA has one.
   	d.	RNA does not contain the base cytosine.

QUESTION 10

1. What is the name used for a molecule in which two carbons of glycerol are attached to fatty acid chains, and the third carbon is attached to a phosphate group?

   	a.	triacylglycerol
   	b.	phospholipid
   	c.	steroid
   	d.	amphipathic

Answer 1

The answer has been marked with red ink.