Week 2 multiple choice questions

Question 1

A high number of H+ (compared to OH-) ions in a solution means that the solution is ………………., whereas a high number of OH- (compared to H+) ions in solution means that the solution is …………………….

Select one:

a. acidic, basic
b. acidic, neutral
c. basic, acidic
d. alkaline, neutral

Answer 1

a

Question 2

Select the statement that is most correct regarding chemical bonds.

Select one:

a. Covalent bonds only ever involve the sharing of one electron
b. Ionic bonds involve the sharing of electrons between two atoms.
c. Covalent bonds involve the sharing of one or more electrons between one or more atoms
d. Covalent bonding involves the transfer of an electron between atoms to form ions that then are attracted to each other

Answer 2

c

Question 3

Which is the smallest out of the following?

Select one:

a. Electron
b. Atom
c. Proton
d. Element

Answer 3

a

Question 4

Excessive retention of CO2 in the blood stream caused by poor lung function will result in:

Hint: Consider the carbonic acid-bicarbonate buffer system equation (CO2 + H2O ↔ H2CO3 ↔ H+ + HCO3-)

Select one:

a. The blood becoming too basic
b. The pH of the blood becomes too high
c. The onset of acidosis (blood pH drops)
d. The excessive formation of HCl

Answer 4

c

Question 5

A long chain of simple sugars would be a:

Select one:

a. monosaccharide.
b. polysaccharide.
c. nucleic acid.
d. protein.

Answer 5

b

Question 6

Select the most correct statement regarding nucleic acids.

Select one:

a. DNA is a long, double-stranded molecule made up of A, T, G, and C nucleotides.
b. Nucleic acids have the building blocks of glycerol and fatty acid chains
c. Three forms of nucleic acid exists: DNA, RNA, and lipids
d. RNA is a long, double-stranded molecule made up of the nucleotides A, T, G, and C.

Answer 6

a

Question 7

A solution that has a pH of 1 could best be described as being:

Select one:

a. strongly alkaline
b. weakly acidic
c. strongly acidic
d. neutral

Answer 7

c

Question 8

Which of the following would be regarded as an organic molecule?

Select one:

a. H2O
b. NaOH
c. CH4
d. NaCl

Answer 8

c

Question 9

A buffer is a solution that ___________________ pH

Select one:

a. promotes changes to
b. doesn’t have a
c. always decreases
d. resists changes to

Answer 9

d

Question 10

Carbonic acid is a ________ acid that ___________ dissociates in solution

Select one:

a. strong, partially
b. weak, fully
c. strong, fully
d. weak, partially

Answer 10

d

Question 11

The formula C6H12O6 means:

Select one:

a. This is an inorganic molecule
b. the substance is a colloid.
c. the molecular weight is 24.
d. there are 12 hydrogen, 6 carbon and 6 oxygen atoms bonded together.

Answer 11

d

Question 12

If atom X has an atomic number of 74 it would have ________.

Select one:

a. 37 protons and 37 neutrons
b. 37 electrons
c. 74 protons and no neutrons
d. 74 protons and 74 electrons

Answer 12

d

Question 13

Human blood has a pH of _______

Select one:

a. 8.1
b. 6.8
c. 7.4
d. 5.9

Answer 13

c

Question 14

Which of the following is an example of a strong base?

Select one:

a. Ca2CO3
b. H2O
c. NaOH
d. HCl

Answer 14

c

Question 15

Seeing O = O written as part of a structural formula means:

Select one:

a. the oxygen atoms are double bonded meaning they are sharing two electrons in their valence shells
b. both oxygen atoms are bonded and have zero electrons in the outer orbit.
c. zero equals zero
d. this is an ionic bond with two shared electrons.

Answer 15

a

Question 16

What occurred to Hydrogen (H) for it to become H+

Select one:

a. Gained an electron
b. Gained a proton
c. Lost an electron
d. Lost a neutron

Answer 16

c

Question 17

Which of the following is not a function that water plays in our bodies?

Select one:

a. Plays a role in many chemical reactions
b. Excellent at cushioning
c. High heat capacity
d. Non-polar solvent

Answer 17

d

Question 18

The four elements that make up about 96% of body matter are:

Select one:

a. carbon, oxygen, phosphorus, calcium.
b. carbon, oxygen, hydrogen, nitrogen.
c. nitrogen, hydrogen, calcium, sodium.
d. sodium, potassium, hydrogen, oxygen.

Answer 18

b

Question 19

Sucrose is a ________________

Select one:

a. Protein
b. Steroid
c. Triglyceride
d. Disaccharide

Answer 19

d

Question 20

Amino acids are the building block for ______________

Select one:

a. Polysaccharides
b. Proteins
c. DNA and RNA
d. Lipids

Answer 20

b

Question 21

When added to water salts:

Select one:

a.
Float on top as they are unable to mix with water

b.
Remain unchanged sinking to the bottom

c.
Bind to form new salt structures

d.
Dissociate into their component ions

Answer 21

d

Question 22

Metabolic alkalosis results in a ________ pH as a result of an issue with the __________________

Select one:

a.
Low, lungs

b.
High, lungs

c.
high, the kidneys (or another non-lung organ)

d.
Low, kidneys (or another non-lung organ)

Answer 22

c

Question 23

Carbonic acid (H2CO3) can partially dissociate into:

Select one:

a.
H+ ions, C+ ions and O3- ions

b.
H+ ions and Cl- ions

c.
H+ ions and bicarbonate (HCO3-) ions

d.
OH- ions and CHO2- ions

Answer 23

c

Question 24

A solution with a pH of 11:

Select one:

a.
Is neutral

b.
Is strongly acidic

c.
Has more H+ ions in solution than OH- ions

d.
Has more OH- ions in solution than H+ ions

Answer 24

d

Question 25

The genetic information is coded in DNA by:

Select one:

a.
the three-dimensional structure of the double helix.

b.
the structure of the histones.

c.
the regular alteration of sugar and phosphate molecules.

d.
the sequence of the nucleotides.

Answer 25

d

Question 26

In regards to enzymes which of the following is NOT true?

Select one:

a.
They can participate in many reactions, ie they are not used just once

b.
They are used up in chemical reactions

c.
They speed up reactions

d.
They are a subset of proteins

Answer 26

b

Question 27

A high concentration of H+ ions will result in a solution with a ………………………..

Select one:

a.
high pH

b.
low pH

c.
neutral pH

d.
no charge

Answer 27

b

Question 28

Considering the electron shells/orbits of atoms. The innermost shell closest to the nucleus normally contains a maximum of _____ electrons

Select one:

a.
4

b.
8

c.
2

d.
12

Answer 28

c

Question 29

In DNA, adenine binds to:

Select one:

a.
guanine

b.
uracil

c.
cytosine

d.
thymine

Answer 29

d

Question 30

An anion is:

Select one:

a.
A negatively charged ion

b.
A positively charged ion

c.
A neutral atom

d.
An ion that has donated electrons

Answer 30

a