BIO100 quiz 2

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BIO100
Biology Concepts
Lab 2: Biochemical Analysis

Dec 12 2014 |
Logged in as : MAV2020753

Introduction
Assessment Feedback
Thank you for your participation in this assignment. Your work has been submitted to your instructor. Total score: 25  out of 100, 25%
Question Feedback

Question
1 of 20
The subatomic particles that play the greatest role in cellular chemical reactions are

electrons.

protons.

neutrons.

isotopes.

0  out of  5
The correct answer is:
electrons.

Question
2 of 20
The structural unit that retains the properties of an element is the

molecule.

atom.

cell.

electron.

5  out of  5
Correct!!

Question
3 of 20
Which of the following are found in the nucleus of an atom?

Protons

Neutrons

Electrons

A and B

0  out of  5
The correct answer is:
A and B

Question
4 of 20
The component of an atom or molecule that is most important in determining its chemical properties is the

isotope.

neutron.

electron.

proton.

0  out of  5
The correct answer is:
electron.

Question
5 of 20
What is the maximum number of electrons the innermost shell can hold?

1

2

4

8

0  out of  5
The correct answer is:
Two

Question
6 of 20
An atom becomes an ion when

it gains or loses electrons.

it gains or loses protons.

it shares hydrogen atoms.

it gains or loses neutrons.

0  out of  5
The correct answer is:
it gains or loses electrons.

Question
7 of 20
The symbol 3CO2 represents

one atom of oxygen and three atoms of carbon.

three atoms of carbon and one molecule of oxygen.

three molecules of carbon dioxide.

one atom of carbon and three atoms of oxygen.

0  out of  5
The correct answer is:
three molecules of carbon dioxide.

Question
8 of 20
In water, hydrogen bonding occurs between the hydrogen and

an oxygen atom in the same molecule.

an oxygen atom in a different molecule.

a hydrogen atom in a different molecule.

a hydrogen atom in the same molecule.

5  out of  5
Correct!!

Question
9 of 20
Covalent bonds form when one atom _________ its _________ with another atom.

gives up; electrons

shares; protons

gives up; neutrons

shares; electrons

0  out of  5
The correct answer is:
shares; electrons

Question
10 of 20
Water is an important solvent of life because

it forms covalent bonds.

it has cohesive properties.

it forms hydrogen bonds.

it is ionic.

0  out of  5
The correct answer is:
it forms hydrogen bonds.

Question
11 of 20
Carbon is such an important molecule for life because

it can form chemical bonds with a maximum of four other atoms.

it can hydrogen bond to so many other molecules.

it forms ionic bonds.

it can form isomers.

0  out of  5
The correct answer is:
it can form chemical bonds with a maximum of four other atoms.

Question
12 of 20
Pure water has a pH of ________ because it is_________.

0; neither acidic nor basic

1; acidic

7; neither acidic nor basic

14; basic

0  out of  5
The correct answer is:
7; neither acidic nor basic

Question
13 of 20
Hydrolysis could be correctly described as

heating a compound to drive off excess water and concentrate its volume.

breaking of a long-chain compound into its subunits by adding water to the structure between its subunits.

constant removal of hydrogen atoms from a carbohydrate.

None of the above.

5  out of  5
Correct!!

Question
14 of 20
Carbohydrate monomers are united into a polymer by means of

dehydrogenation.

hydrolysis.

reverse osmosis.

dehydration synthesis.

0  out of  5
The correct answer is:
dehydration synthesis.

Question
15 of 20
Polysaccharides are made up of

Amino acids.

nucleotides.

sugars.

lipids.

5  out of  5
Correct!!

Question
16 of 20
Butter is made of milkfat and tends to be hard at room temperature. Which of the following could be used to make the...