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BI231 > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q 
The class of lipids forming a major part of cell membranes is \_\_\_\_\_\_\_\_\_.
steroids
nucleic acids
polysaccharides
triglycerides
phospholipids
A

phospholipids

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2
Q 
A long chain of simple sugars would be a(n)
protein
nucleic acid
polysaccharide
monosaccharide
A

polysaccharide

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3
Q

RNA plays a role in which of the following?
Transferring hereditary information from cell to cell when cells divide

Copying instructions from DNA

Transferring hereditary information from cell to cell when cells divide

Synthesizing proteins and copying instructions from DNA

Synthesizing lipids

A

Synthesizing proteins and copying instructions from DNA

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4
Q

Triglycerides consist of a 3-carbon compound called __________ bound to three __________.

A

glycerol; fatty acids

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5
Q

The breakdown of glucose to yield carbon dioxide, oxygen, and ATP can be described as __________.

A

catabolic and exergonic

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6
Q

Choose the correct statement regarding mixtures and compounds.

Most mixtures in our bodies consist of compounds dissolved or suspended in water.

In a mixture, each substance takes on new chemical properties.

A compound has properties much different from the properties of its elements.

All mixtures are also compounds.

A

A compound has properties much different from the properties of its elements.

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7
Q

When table salt, sodium chloride (NaCl), is placed in water __________.

Ionic bonds between Na+ and Cl- are broken

Na+ and Cl- form ionic bonds with each other

Na+ and Cl- form hydrogen bonds with water

A

Ionic bonds between Na+ and Cl- are broken

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8
Q

Chemical reactions in which larger molecules are broken down into smaller ones are called catabolic reactions.
True
False

A

True

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9
Q

AB → A + B

A

Catabolic reaction

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10
Q

A + B → AB

A

Anabolic reaction

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11
Q

AB+CD → AC + BD

A

Exchange reaction

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12
Q

Glucose + galactose => lactose is an example of _______.

A

an anabolic reaction

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13
Q

Identify the factors that govern the speed and direction of a reaction.
Reaction rates increase when the reactants are more concentrated.

Reaction rates increase when the products are more concentrated.

Reaction rates increase as the temperature rises.

Reaction rates decrease when catalysts are present.

A

Reaction rates increase when the reactants are more concentrated.

Reaction rates increase as the temperature rises.

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14
Q

ATP + glucose => glucose-6-phosphate + ADP is an example of _________.

A

an exchange reaction

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15
Q

Anabolism consists of energy-releasing reactions, such as the production of protein or fat.
True
False

A

False

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16
Q

Catabolism consists of energy-releasing decomposition reactions.
True
False

A

True

17
Q

The breakdown of glucose to yield carbon dioxide, oxygen, and ATP can be described as __________.

A

catabolic and exergonic

18
Q

A typical exchange reaction would look like:
A + B <=> AB
AB -> A + B
AB + CD -> AD + CB

A

AB + CD -> AD + CB

19
Q 
An enzyme is substrate-specific because of the shape of its \_\_\_\_\_\_\_\_\_\_.
terminal amino acid
alpha chain
active site
secondary structure
receptor
A

active site

20
Q

The class of organic compounds that are the primary source of energy for the body is

A

carbohydrates

21
Q

The most important high energy compound in cells is

A

adenosine triphosphate (ATP)

22
Q

A(n) __________ is a group of atoms that determines many of the properties of an organic molecule.

A

functional group

23
Q 
An example of a polysaccharide
Glucose
Glycogen
Lactose
Prostoglandins
Lactic acid
A

Glycogen

24
Q

A molecule composed of two fatty acids and a phosphate group attached to glycerol is a _________.

A

phospholipid

25
Q 
A buffer usually consists of a \_\_\_\_\_\_\_.
salt
electrolyte
weak acid
strong base
strong acid
A

weak acid

26
Q

When dissolved in water, compounds that always dissociate into H+ ions and one or more anions are ______.

A

acids

27
Q

A solution is a mixture of two or more substances that are physically blended but not chemically combined.
True
False

A

True

28
Q

All amino acids have both a carboxyl group and an amino group attached to a central carbon.
True
False

A

True

29
Q

Identify the true statements regarding DNA.

It is copied into RNA that is then passed on to future generations.

It gives instructions for synthesizing all of the body’s proteins.

It constitutes our genes.

It assembles amino acids in the right order to produce each protein.

A

It gives instructions for synthesizing all of the body’s proteins.

It constitutes our genes.

It assembles amino acids in the right order to produce each protein.

30
Q 
Specify whether each of the items listed is hydrophilic or hydrophobic.
Ions
Carbohydrates
Glucose
Phosphate
A

All Hydrophilic

31
Q 
Phospholipids
Lipids
Triglycerides 
Cholesterol
Steroids
Prostaglandins
A

All Hydrophobic

BI231 (24 decks)

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