Exam 1

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Question #1

An example of dehydration reaction is _____.

A DNA and water reacting to form nucleotides

B starch and water reacting to form glucose molecules

C a dipeptide and water reacting to form two amino acids

D two glucose molecules reacting to form maltose and water

Question #2

Which molecules is not a carbohydrate?

A disaccharide

B fatty acids

C polysaccharide

D starch

Question #3

DNA is made of _____.

A nucleotides

B fatty acids

C monosaccharides

D amino acids

Question #4

The sequence GAACUU may be found in _____.

A RNA only

B both DNA and RNA

C DNA only

D neither DNA nor RNA

Question #5

Which statement about RNA is correct?

A RNA is made of amino acids.

B RNA is double-stranded.

C RNA contains thymine (T).

D RNA is single-stranded.

Question #6

One function of RNA molecules is to _____.

A carry messages from DNA to ribosomes

B copy themselves

C copy DNA

D pass genetic information to offspring

Question #7

The tertiary structure of a protein is the _____.

A order of amino acids

B α-helix and β-pleated sheet

C three-dimensional shape of the protein

D complex of multiple protein subunits (polypeptides)

Question #8

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

A on the outside of the protein, interacting with water

B on the inside of the protein, away from water

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

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

Question #9

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

A primary

B secondary

C quaternary

D tertiary

Question #10

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

A 44

B 90

C 46

D 45

Question #11

The secondary structure of a protein is the _____.

A complex of multiple protein subunits (polypeptides)

B order of amino acids

C three-dimensional shape of the protein

D α-helix or β-pleated sheet

Question #12

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

A quaternary

B primary

C secondary

D tertiary

Question #13

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

A primary

B quaternary

C tertiary

D secondary

Question #14

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

A hydrophilic functional groups

B charged functional groups

C polar covalent bonds

D nonpolar covalent bonds

Question #15

Saturated fats ______.

A are solid at room temperature

B have multiple double bonds in their fatty acids

C are liquid at room temperature

D are more common in plants than in animals

Question #16

Which molecule are hydrophobic?

A lipids

B carbohydrates

C nucleic acids

D proteins

Question #17

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

A disaccharide

B starch

C monosaccharide

D polysaccharide

Question #18

On foods packages, “fiber” refers to _____.

A starch

B proteins

C fats

D cellulose

Question #19

The structural polysaccharide, cellulose, is found in _____.

A bacterial cell walls

B animal cell membranes

C plant cell walls

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 amino group

B hydroxyl group

C methyl group

D phosphate group

Question #22

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

A no bonds

B ionic bonds

C covalent bonds

D hydrogen bonds

Question #23

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

A polymer

B hydrocarbon

C functional group

D isomer

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 1

B 2

C 100

D 10

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 1

C 100

D 10

Question #26

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

A NaCl dissolves more in pure water

B NaCl dissolves more in methanol

Question #27

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

A acts as an acid

B dissociates completely

C is a strong buffer

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 decreasing the H+ concentration

B increasing the H+ ion concentration

C decreasing the ocean temperature

D increasing the amount of carbonate ions

Question #29

For water to evaporate, _____ must be broken.

A hydrogen bonds

B nonpolar covalent bonds

C polar covalent bonds

D ionic bonds

Question #30

Which bond or interaction is the strongest?

A covalent bond

B van der Waals interaction

C hydrogen bond

D hydrophobic interaction

Question #31

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

A protons

B number of electrons

C atomic number

D number of protons + neutrons

Question #32

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

A approximately 8 amu (daltons)

B approximately 8 grams

C approximately 16 amu (daltons)

D approximately 16 grams

Question #33

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

A 16 neutrons

B 8 protons and 8 neutrons

C 16 protons

D 16 protons and 16 neutrons

Question #34

Which four elements make up approximately 96% of living matter

A carbon, sodium, hydrogen, nitrogen

B carbon, oxygen, phosphorus, hydrogen

C oxygen, hydrogen, calcium, nitrogen

D carbon, hydrogen, nitrogen, oxygen

Question #35

Which is NOT a characteristic of all living organisms?

A ability to photosynthesize

B interaction with the environment

C use of DNA as the genetic material

D emergent properties

Question #36

A control group is _____.

A exposed to several variables

B matched with the experimental group except for one variable

C left alone by the experiments

D kept in an unchanging environment

Question #37

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

A decomposers include both bacteria and fungi

B plants convert light energy to chemical energy

C there is a universal genetic code

D enzymes are used by all cells

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 gene flow

B natural selection

C beak selection

D a common ancestor

Question #39

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

A population

B ecosystem

C family

D community

Question #40

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

A a biosphere

B an organism

C a community

D a population

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