Exam 1

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Question #1

An example of dehydration reaction is _____.

A DNA and water reacting to form nucleotides

B two glucose molecules reacting to form maltose and water

C a dipeptide and water reacting to form two amino acids

D starch and water reacting to form glucose molecules

Question #2

Which molecules is not a carbohydrate?

A polysaccharide

B starch

C disaccharide

D fatty acids

Question #3

DNA is made of _____.

A monosaccharides

B fatty acids

C nucleotides

D amino acids

Question #4

The sequence GAACUU may be found in _____.

A both DNA and RNA

B RNA only

C neither DNA nor RNA

D DNA only

Question #5

Which statement about RNA is correct?

A RNA contains thymine (T).

B RNA is double-stranded.

C RNA is single-stranded.

D RNA is made of amino acids.

Question #6

One function of RNA molecules is to _____.

A carry messages from DNA to ribosomes

B copy themselves

C pass genetic information to offspring

D copy DNA

Question #7

The tertiary structure of a protein is the _____.

A α-helix and β-pleated sheet

B order of amino acids

C complex of multiple protein subunits (polypeptides)

D three-dimensional shape of the protein

Question #8

In a cellular protein, where would you expect to find a hydrophilic amino acid?

A on the outside of a membrane protein, interacting with phospholipid fatty acid tails

B on the outside of the protein, interacting with lipid molecules

C on the outside of the protein, interacting with water

D on the inside of the protein, away from water

Question #9

The α-helix and β-pleated sheet are examples of _____ protein structure.

A quaternary

B secondary

C primary

D tertiary

Question #10

How many peptide bonds are present in a protein that contains 45 amino acids?

A 90

B 44

C 46

D 45

Question #11

The secondary structure of a protein is the _____.

A three-dimensional shape of the protein

B complex of multiple protein subunits (polypeptides)

C order of amino acids

D α-helix or β-pleated sheet

Question #12

A β-pleated sheet is an example of _____ structure.

A tertiary

B secondary

C primary

D quaternary

Question #13

Collagen is a protein made of three polypeptides. This means that collagen has _____ structure.

A quaternary

B primary

C secondary

D tertiary

Question #14

Hydrocarbons have mostly _____, which makes them insoluble in water.

A polar covalent bonds

B nonpolar covalent bonds

C charged functional groups

D hydrophilic functional groups

Question #15

Saturated fats ______.

A are solid at room temperature

B are liquid at room temperature

C are more common in plants than in animals

D have multiple double bonds in their fatty acids

Question #16

Which molecule are hydrophobic?

A proteins

B nucleic acids

C carbohydrates

D lipids

Question #17

Lactose, a sugar in milk, is one glucose molecule bonded to one galactose molecule. Lactose is a(n) _____.

A starch

B monosaccharide

C disaccharide

D polysaccharide

Question #18

On foods packages, “fiber” refers to _____.

A fats

B starch

C proteins

D cellulose

Question #19

The structural polysaccharide, cellulose, is found in _____.

A plant cell walls

B bacterial cell walls

C animal cell membranes

D amyloplast, plant organelles that store carbohydrates

Question #20

Reactions that build polymers are an example of _____ reactions.

A hydrolysis

B breakdown

C dehydration

D monomer

Question #21

Which functional group in ATP is part of the process that releases energy for cells to use?

A hydroxyl group

B methyl group

C amino group

D phosphate group

Question #22

A carbon atom is most likely to form _____ with other atoms.

A no bonds

B hydrogen bonds

C covalent bonds

D ionic bonds

Question #23

A group of atoms, commonly found together in biological molecules, that participates in reactions is called _____.

A polymer

B isomer

C hydrocarbon

D functional group

Question #24

If the pH of a solution is increased from pH 5 to pH 7, this means the solution is ____ times more basic now.

A 100

B 1

C 10

D 2

Question #25

If the pH of a solution is decreased from pH 8 to pH 6, this means the solution is ____ times more acidic now.

A 2

B 100

C 10

D 1

Question #26

Will table salt (NaCl) dissolve more in methanol (a nonpolar substance ) or pure water?

A NaCl dissolves more in methanol

B NaCl dissolves more in pure water

Question #27

In a aqueous solution, a strong base like NaOH _____.

A acts as an acid

B is a strong buffer

C dissociates completely

D decreases the pH

Question #28

Too much atmospheric carbon dioxide damages coral reefs in the ocean. Which factor is a cause of this damage?

A increasing the H+ ion concentration

B increasing the amount of carbonate ions

C decreasing the ocean temperature

D decreasing the H+ concentration

Question #29

For water to evaporate, _____ must be broken.

A ionic bonds

B polar covalent bonds

C nonpolar covalent bonds

D hydrogen bonds

Question #30

Which bond or interaction is the strongest?

A hydrophobic interaction

B hydrogen bond

C covalent bond

D van der Waals interaction

Question #31

Two atoms that have the same mass number must have the same _____.

A protons

B number of electrons

C number of protons + neutrons

D atomic number

Question #32

Oxygen has an atomic number 8 and a mass number of 16. What is the atomic mass of oxygen

A approximately 8 grams

B approximately 16 grams

C approximately 16 amu (daltons)

D approximately 8 amu (daltons)

Question #33

The atomic number of sulfur is 16, which means that sulfur has _____.

A 8 protons and 8 neutrons

B 16 neutrons

C 16 protons

D 16 protons and 16 neutrons

Question #34

Which four elements make up approximately 96% of living matter

A oxygen, hydrogen, calcium, nitrogen

B carbon, hydrogen, nitrogen, oxygen

C carbon, oxygen, phosphorus, hydrogen

D carbon, sodium, hydrogen, nitrogen

Question #35

Which is NOT a characteristic of all living organisms?

A interaction with the environment

B ability to photosynthesize

C emergent properties

D use of DNA as the genetic material

Question #36

A control group is _____.

A kept in an unchanging environment

B exposed to several variables

C left alone by the experiments

D matched with the experimental group except for one variable

Question #37

Strong evidence for the common ancestry of all life comes from the fact that _____.

A enzymes are used by all cells

B decomposers include both bacteria and fungi

C there is a universal genetic code

D plants convert light energy to chemical energy

Question #38

The individuals in a species that are better able to survive and reproduce will pass more of their genes on to the next generation. This is called _____.

A beak selection

B gene flow

C a common ancestor

D natural selection

Question #39

All of the individuals if the same species living within a specified area are known as _____.

A ecosystem

B family

C community

D population

Question #40

All of the organisms inhabiting a particular ecosystem are known as _____.

A an organism

B a community

C a population

D a biosphere

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