chapter 17 test tophat review

Which statement is NOT true?

All lipids contain fatty acids.

Excess cholesterol in the blood can lead to a build up of plaque.

TRUE

Glycoproteins are components of cell membranes.

TRUE

Hydrogenation of the double bonds in unsaturated fats requires a catalyst..

TRUE

In the fluid-mosaic model of cell membranes, the lipid molecules are oriented with their heads to the outside of the membrane.

TRUE

Many sex hormones are steroids.

TRUE

Oleic acid is an unsaturated fatty acid.

TRUE

One function of phospholipids is to provide structure to biomembranes.

TRUE

Sphingolipids contain fatty acids.

TRUE

Steroids do not contain fatty acids.

TRUE

The tail of a triacylglycerol is the nonpolar end.

TRUE

A triacylglycerol that is solid at room temperature is called a(n)

fat

The products of the acid catalyzed hydrolysis of a fat are

fatty acids and glycerol.

The components in the following glycerophospholipid are

glycerol; palmitic acid; phosphate; and ethanolamine.

A lecithin contains the following components:

glycerol; two fatty acids; phosphate and an amino alcohol

The main lipid components in cellular membranes are

glycerolphospholipids.

In this diagram of a cell membrane, the object labeled (B) is a

glycerophospholipid bilayer.

The type of lipid that gives a cell membrane its shape is a

glycerophospholipid.

In the list below, which lipid type is most soluble in water?

glycerophospholipids

Commercially, liquid vegetable oils are converted to solid fats such as margarine by

hydrogenation

In this diagram of a cell membrane, the object labeled (C) is a

hydrophobic region.

Which of the following is NOT a function of lipids in the human body?

pH regulation

Glycerophospholipids can interact both with other lipids and water because they contain both __________ and __________.

polar regions; nonpolar regions

Palmitic acid is an unsaturated fatty acid.

FALSE

The catalyst needed for saponification is H+ ion.

FALSE

the interior of a lipid bilayer is the hydrophilic region

FALSE

The steroid hormone that increases the blood glucose and glycogen levels from fatty acids and amino acids is

cortisone

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the number of kilocalories from fat. (1 gram of fat = 9 kcal; 1 gram of carbohydrate or protein delivers 4 kcal.)

350 kcal from fat

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the percentage of total kilocalories due to fat (1 gram of fat = 9 kcal).

55% of total kilocalories

Which of the following is NOT a lipid?

DNA

Bile salts help in the digestion of protein

FALSE

DNA is a lipid.

FALSE

Most plant lipids are saturated lipids.

FALSE

Olestra is a triacylglycerol.

FALSE

Channel proteins in cell membranes serve what function?

They provide pathways for water and electrolytes to move through cell membranes.

According to the fluid-mosaic model of a cell membrane, the main component of a membrane is

a lipid bilayer

Waxes are lipids derived from

a long-chain alcohol and a long-chain fatty acid.

Which of the following is NOT a function of glycerophospholipids?

aid in digestion

In this diagram of a cell membrane, the objects labeled (A) are

carbohydrate side chain.

Lipids are compounds that are soluble in

chloroform

In this diagram of a cell membrane, the object labeled (D) is part of a

cholesterol

One inner component of a typical cell membrane is

cholesterol

Which of the following is a lipid?

cholesterol

Which of the following lipids will give no fatty acid when hydrolyzed?

cholesterol

the most common type of gallstones is composed of almost pure

cholesterol

A polyunsaturated fatty acid contains more than one

double bond

Which of the following compounds is a glycerolphospholipid?

lecithin

Synthesis of cholesterol and bile salts takes place in the

liver

Compared to saturated fatty acids, unsaturated fatty acids have

lower melting points

The steroid hormone present in birth control pills is

norethindrone

Which of the following is an unsaturated fatty acid?

oleic

In this diagram of a cell membrane, the objects labeled (E) are

proteins.

The products of the saponification of a fat are

salts of fatty acids and glycerol.

Margarine containing partially hydrogenated soybean oil is solid because

some of its double bonds have been converted to single bonds.

What phospholipid contains fatty acids but NOT glycerol?

sphingolipid

Which of the following is NOT a lipoprotein that carries nonpolar lipids through the bloodstream?

sphingosine

Which of the following fatty acids is a solid at room temperature?

stearic

Unsaturated fatty acids have lower melting points than saturated fatty acids because

the cis double bonds give them an irregular shape.

In the lipid bilayer of a cell membrane

the hydrophilic heads are on the inner and outer surface and the hydrophobic tails in the middle

A lipoprotein particle functions to

transport nonpolar lipids to body cells.

Which of the following is a polyunsaturated fat?

trilinolein

In the fluid-mosaic model that describes plasma membranes,

two layers of glycerophospholipid molecules have their nonpolar sections oriented to the inside of the membrane.

Which of the following lipids will give a single molecule of fatty acid when hydrolyzed?

wax