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 starch and water reacting to form glucose molecules

C two glucose molecules reacting to form maltose and water

D DNA and water reacting to form nucleotides

Question #2

Which molecules is not a carbohydrate?

A disaccharide

B starch

C fatty acids

D polysaccharide

Question #3

DNA is made of _____.

A monosaccharides

B amino acids

C fatty acids

D nucleotides

Question #4

The sequence GAACUU may be found in _____.

A neither DNA nor RNA

B DNA only

C RNA only

D both DNA and RNA

Question #5

Which statement about RNA is correct?

A RNA is single-stranded.

B RNA is made of amino acids.

C RNA is double-stranded.

D RNA contains thymine (T).

Question #6

One function of RNA molecules is to _____.

A pass genetic information to offspring

B copy themselves

C carry messages from DNA to ribosomes

D copy DNA

Question #7

The tertiary structure of a protein is the _____.

A order of amino acids

B three-dimensional shape of the protein

C α-helix and β-pleated sheet

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 a membrane protein, interacting with phospholipid fatty acid tails

B on the inside of the protein, away from water

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

D on the outside of the protein, interacting with water

Question #9

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

A tertiary

B secondary

C primary

D quaternary

Question #10

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

A 45

B 90

C 46

D 44

Question #11

The secondary structure of a protein is the _____.

A order of amino acids

B complex of multiple protein subunits (polypeptides)

C α-helix or β-pleated sheet

D three-dimensional shape of the protein

Question #12

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

A quaternary

B primary

C tertiary

D secondary

Question #13

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

A secondary

B quaternary

C tertiary

D primary

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 are liquid at room temperature

C have multiple double bonds in their fatty acids

D are more common in plants than in animals

Question #16

Which molecule are hydrophobic?

A nucleic acids

B proteins

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 disaccharide

B monosaccharide

C polysaccharide

D starch

Question #18

On foods packages, “fiber” refers to _____.

A starch

B cellulose

C fats

D proteins

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 dehydration

B breakdown

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 methyl group

C amino group

D hydroxyl group

Question #22

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

A hydrogen bonds

B no bonds

C ionic bonds

D covalent 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 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 10

B 2

C 1

D 100

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 dissociates completely

B decreases the pH

C acts as an acid

D is a strong buffer

Question #28

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

A decreasing the ocean temperature

B increasing the H+ ion concentration

C increasing the amount of carbonate ions

D decreasing the H+ concentration

Question #29

For water to evaporate, _____ must be broken.

A hydrogen bonds

B ionic bonds

C nonpolar covalent bonds

D polar covalent bonds

Question #30

Which bond or interaction is the strongest?

A van der Waals interaction

B covalent bond

C hydrogen bond

D hydrophobic interaction

Question #31

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

A number of protons + neutrons

B number of electrons

C atomic number

D protons

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 8 grams

C approximately 8 amu (daltons)

D approximately 16 amu (daltons)

Question #33

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

A 16 neutrons

B 16 protons and 16 neutrons

C 16 protons

D 8 protons and 8 neutrons

Question #34

Which four elements make up approximately 96% of living matter

A carbon, sodium, hydrogen, nitrogen

B oxygen, hydrogen, calcium, nitrogen

C carbon, oxygen, phosphorus, hydrogen

D carbon, hydrogen, nitrogen, oxygen

Question #35

Which is NOT a characteristic of all living organisms?

A interaction with the environment

B use of DNA as the genetic material

C ability to photosynthesize

D emergent properties

Question #36

A control group is _____.

A matched with the experimental group except for one variable

B kept in an unchanging environment

C exposed to several variables

D left alone by the experiments

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 a common ancestor

C natural selection

D gene flow

Question #39

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

A family

B ecosystem

C population

D community

Question #40

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

A a biosphere

B a population

C an organism

D a community

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