Exam 1

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Question #1

An example of dehydration reaction is _____.

A a dipeptide and water reacting to form two amino acids

B DNA and water reacting to form nucleotides

C starch and water reacting to form glucose molecules

D two glucose molecules reacting to form maltose and water

Question #2

Which molecules is not a carbohydrate?

A fatty acids

B starch

C polysaccharide

D disaccharide

Question #3

DNA is made of _____.

A monosaccharides

B nucleotides

C amino acids

D fatty acids

Question #4

The sequence GAACUU may be found in _____.

A both DNA and RNA

B DNA only

C RNA only

D neither DNA nor RNA

Question #5

Which statement about RNA is correct?

A RNA is made of amino acids.

B RNA is single-stranded.

C RNA is double-stranded.

D RNA contains thymine (T).

Question #6

One function of RNA molecules is to _____.

A copy DNA

B pass genetic information to offspring

C copy themselves

D carry messages from DNA to ribosomes

Question #7

The tertiary structure of a protein is the _____.

A order of amino acids

B complex of multiple protein subunits (polypeptides)

C three-dimensional shape of the protein

D α-helix and β-pleated sheet

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 outside of the protein, interacting with lipid molecules

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

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 secondary

B quaternary

C tertiary

D primary

Question #10

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

A 44

B 45

C 90

D 46

Question #11

The secondary structure of a protein is the _____.

A three-dimensional shape of the protein

B α-helix or β-pleated sheet

C order of amino acids

D complex of multiple protein subunits (polypeptides)

Question #12

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

A primary

B secondary

C tertiary

D quaternary

Question #13

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

A quaternary

B secondary

C primary

D tertiary

Question #14

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

A polar covalent bonds

B hydrophilic functional groups

C nonpolar covalent bonds

D charged functional groups

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 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 monosaccharide

B starch

C disaccharide

D polysaccharide

Question #18

On foods packages, “fiber” refers to _____.

A cellulose

B starch

C proteins

D fats

Question #19

The structural polysaccharide, cellulose, is found in _____.

A bacterial cell walls

B plant 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 breakdown

B dehydration

C monomer

D hydrolysis

Question #21

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

A phosphate group

B hydroxyl group

C methyl group

D amino group

Question #22

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

A hydrogen bonds

B covalent bonds

C ionic bonds

D no bonds

Question #23

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

A polymer

B hydrocarbon

C isomer

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 1

B 100

C 2

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 10

B 100

C 2

D 1

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 decreases the pH

C is a strong buffer

D dissociates completely

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 decreasing the ocean temperature

C increasing the H+ ion concentration

D increasing the amount of carbonate ions

Question #29

For water to evaporate, _____ must be broken.

A nonpolar covalent bonds

B ionic bonds

C hydrogen bonds

D polar covalent bonds

Question #30

Which bond or interaction is the strongest?

A hydrogen bond

B covalent bond

C hydrophobic interaction

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 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 16 grams

B approximately 16 amu (daltons)

C approximately 8 grams

D approximately 8 amu (daltons)

Question #33

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

A 16 protons

B 16 protons and 16 neutrons

C 8 protons and 8 neutrons

D 16 neutrons

Question #34

Which four elements make up approximately 96% of living matter

A carbon, hydrogen, nitrogen, oxygen

B carbon, oxygen, phosphorus, hydrogen

C carbon, sodium, hydrogen, nitrogen

D oxygen, hydrogen, calcium, nitrogen

Question #35

Which is NOT a characteristic of all living organisms?

A emergent properties

B interaction with the environment

C ability to photosynthesize

D use of DNA as the genetic material

Question #36

A control group is _____.

A matched with the experimental group except for one variable

B left alone by the experiments

C exposed to several variables

D kept in an unchanging environment

Question #37

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

A plants convert light energy to chemical energy

B decomposers include both bacteria and fungi

C enzymes are used by all cells

D there is a universal genetic code

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 a common ancestor

B beak selection

C gene flow

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 population

D community

Question #40

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

A a biosphere

B an organism

C a population

D a community

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