Exam 1

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Question #1

An example of dehydration reaction is _____.

A two glucose molecules reacting to form maltose and water

B DNA and water reacting to form nucleotides

C starch and water reacting to form glucose molecules

D a dipeptide and water reacting to form two amino acids

Question #2

Which molecules is not a carbohydrate?

A fatty acids

B polysaccharide

C disaccharide

D starch

Question #3

DNA is made of _____.

A monosaccharides

B amino acids

C nucleotides

D fatty acids

Question #4

The sequence GAACUU may be found in _____.

A both DNA and RNA

B neither DNA nor RNA

C DNA only

D RNA only

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 carry messages from DNA to ribosomes

C copy DNA

D copy themselves

Question #7

The tertiary 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 and β-pleated sheet

Question #8

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

A on the inside of the protein, away from water

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

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 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 45

C 90

D 46

Question #11

The secondary structure of a protein is the _____.

A complex of multiple protein subunits (polypeptides)

B three-dimensional shape of the protein

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 charged functional groups

B polar covalent bonds

C nonpolar covalent bonds

D hydrophilic functional groups

Question #15

Saturated fats ______.

A are more common in plants than in animals

B are solid at room temperature

C are liquid at room temperature

D have multiple double bonds in their fatty acids

Question #16

Which molecule are hydrophobic?

A lipids

B proteins

C carbohydrates

D nucleic acids

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 proteins

C fats

D starch

Question #19

The structural polysaccharide, cellulose, is found in _____.

A amyloplast, plant organelles that store carbohydrates

B animal cell membranes

C plant cell walls

D bacterial cell walls

Question #20

Reactions that build polymers are an example of _____ reactions.

A dehydration

B monomer

C breakdown

D hydrolysis

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 phosphate group

D methyl group

Question #22

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

A covalent bonds

B hydrogen 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 hydrocarbon

B isomer

C functional group

D polymer

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 10

D 100

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 1

D 2

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 is a strong buffer

B dissociates completely

C acts as an acid

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 ocean temperature

B increasing the amount of carbonate ions

C increasing the H+ ion concentration

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 covalent bond

C hydrogen bond

D van der Waals interaction

Question #31

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

A number of protons + neutrons

B protons

C number of electrons

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 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 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 oxygen, hydrogen, calcium, nitrogen

C carbon, hydrogen, nitrogen, oxygen

D carbon, oxygen, phosphorus, hydrogen

Question #35

Which is NOT a characteristic of all living organisms?

A interaction with the environment

B emergent properties

C use of DNA as the genetic material

D ability to photosynthesize

Question #36

A control group is _____.

A kept in an unchanging environment

B matched with the experimental group except for one variable

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 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 a common ancestor

B natural selection

C beak selection

D gene flow

Question #39

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

A population

B community

C family

D ecosystem

Question #40

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

A an organism

B a population

C a biosphere

D a community

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