Chemistry of Life Test (Ch.1) Flashcards Preview

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Flashcards in Chemistry of Life Test (Ch.1) Deck (29)
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1

In living organisms, buffers do which of the following?

maintain pH in the cells within a narrow range, allowing enzymes to function.

2

What is an example of a monosaccharide?

glucose

3

What element is found in all organic compounds?

Carbon

4

Of the following, which are reasons why molecular models are useful to biologists? Models help...
I. visualize shapes of functional groups
II. visualize isomers
III. visualize the three-dimensional shapes of functional groups
IV. determine the presence of symmetry in molecules
V. predict products of chemical reactions

I, II, III, IV, and V. (all are correct)

5

When a molecule of glycerol reacts with one or more fatty acids an ester linkage results. The formation of this linkage is a result of a reaction between...

An alcohol and a carboxylic acid.

6

In most cellular process, oxidation involves...

the loss of hydrogen atoms

7

When fatty acids and glycerol chemically combine to form a fat, one other product is...

water

8

When two organic molecules are joined together and a water molecule is removed, the reaction is called which of the following?

dehydration synthesis (condensation)

9

The hydrolysis (breakdown) of a dipeptide results in the production of which of the following?

two amino acids

10

When free energy is released during a chemical reaction it is called

an exergonic reaction

11

the following structural formula is representative of which functional group?
-C=O
\
O
|
H

carboxyl

12

the following structural formula is representative of which functional group?
|
C= O
|

carbonyl

13

Enzymes work as catalysts by doing which of the following?

decreasing the activation energy

14

Of the following, which is not considered to be a polymer?

fat

15

Of the following biological compounds, which one contains the element nitrogen?

protein

16

When digested, which of the following substances would yield a mixture of amino acids?

protein

17

The production, or synthesis, of proteins, fats and carbohydrates involves the...

removal of water

18

An oxidation/reduction is best shown by which of the following?

electrons are transfered from one substance to another.

19

The following structural formula is representative of which functional group?
-N-H
|
H

amino

20

Which of the following is the essential characteristic of a polar molecule?

Has an asymmetrical distribution of electrical charge.

21

The extremely large diversity of structure seen in proteins is mainly due to

different numbers, kinds, and sequences of amino acids

22

In humans, the function of glycogen is to

keep glucose avainable

23

Isomers are moleules that

Have the same molecular formula but different structural formula.

24

Of the following 5 statements, which is most correct with respect to enzymes?

all enzymes are catalysts

25

All but one of the following are examples of oxidizing reactions. Which one is NOT an oxidizing reaction?

The synthesis of glucose in a plant

26

In the electron transport chain of the mitochondria, electrons are commonly transferred from one molecule to another. In one such reaction a Fe3+ ion in a cytochrome is converted to a Fe2+ ion. This is known as...

Reduction

27

During the process of glycolysis, some hydrogen atoms are essentially removed from glucose. This is an example of...

Oxidation

28

There are four elements that make up all amino acids. Two of these are carbon and hydrogen. The other two are...

nitrogen and oxygen

29

Many people are aware that water is the most abundant substance in all organisms. However, next to water, what is the major component of living cells?

Proteins