What is FALSE about isomers?

They have different atomic composition.

What two parts (A & B) make up this phospholipid?

Hydrophilic head & hydrophobic tails

What is the best way to describe the high specific heat of water?

It takes a lot of energy to vaporize water.

What is the purpose of a functional group on a molecule?

Determines chemical properties and function of a molecule.

If coffee has a pH value of 5 and vinegar has a pH value of 3, what would the difference of [H+] be between the two?

Vinegar would have 100 times more [H+] than coffee.

Water molecules are able to form hydrogen bonds because _______.

Their partial charges from their polar covalent bonds attract each other.

Why are humans unable to use cellulose?

The human body is unable to break down cellulose.

Which of the following statements is true regarding how polarity relates to hydrophobic/hydrophillic interactions?

Non-polar molecules have no partial charges & have hydrophobic interactions

What is happening during the process of dehydration?

H2O is leaving the reaction and polymers are being formed.

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FA23 LIFE102 Exam 1 Review

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Answers

1
What is FALSE about isomers?
They have the same atomic composition.
They have different structures and properties.
They are mirror images of each other.
They have different atomic composition.
2
In a DNA strand, which base pairs are always linked together?
None of these.
A → T ; C → G
G → T ; A → C
T → C ; A → G
3
What two parts (A & B) make up this phospholipid?
Hydrophilic head & hydrophilic tails
Hydrophilic head & hydrophobic tails
Hydrophobic head & hydrophobic tails
Hydrophobic head & hydrophilic tails
4
Enantiomers are a pair of molecules that are mirror images of each other and can be superimposed on one another.
True
False
5
What is the best way to describe the high specific heat of water?
Water can become very hot and vaporize.
It takes a lot of energy to vaporize water.
It takes little energy to vaporize water.
Water is always vaporized.
6
Sodium (Na) has a mass number of 23 and an atomic number of 11. How many neutrons does Sodium contain?
10
23
11
12
7
What is the purpose of a functional group on a molecule?
Determines chemical properties and function of a molecule.
A functional group makes molecules unable to bond with other molecules.
Functional groups have no effect on a molecule and just add extra atoms.
To determine whether or not a molecule dissolves in water.
8
If coffee has a pH value of 5 and vinegar has a pH value of 3, what would the difference of [H+] be between the two?
Vinegar would have 1,000 times more [H+] than coffee.
Vinegar would have 100 times more [H+] than coffee.
Coffee would have 100 times more [H+] than vinegar.
Coffee would have 1,000 times more [H+] than vinegar.
9
Water molecules are able to form hydrogen bonds because _______.
They are made of anions with excess negative charges.
Their partial charges from their polar covalent bonds attract each other.
They have no charge due to nonpolar covalent bonds.
They are charged due to ionic bonds.
10
A charged atom has a different number of protons and electrons, making it an_______.
Isotope
Ion
Enantiomer
Isomer
11
Why are humans unable to use cellulose?
Humans lack cell walls.
The human body is unable to break down cellulose.
The human body doesn't need cellulose.
Humans have enough cellulose and can’t gain anything from it.
12
Ribosomes carry out _______ synthesis.
Dehydration
Protein
Nuclear
ATP
13
What organelles are involved in the Endosymbiont Theory?
Ribosomes & Mitochondria
Chloroplasts & Endoplasmic Reticulum
Ribosomes & Endoplasmic Reticulum
Mitochondria & Chloroplasts
14
Which of the following statements is true regarding how polarity relates to hydrophobic/hydrophillic interactions?
Non-polar molecules have no partial charges & have hydrophobic interactions
Ionic bonds will determine if the molecule is hydrophobic or hydrophilic.
Polarity does not determine if a molecule is hydrophobic or hydrophilic.
Polar molecules will not interact with water.
15
What is happening during the process of dehydration?
Only oxygen is leaving the reaction.
H2O is leaving the reaction and polymers are being formed.
Water is doubling in the reaction.
H2O is being added to the reaction and polymers are being broken down.

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