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 two glucose molecules reacting to form maltose and water

D a dipeptide and water reacting to form two amino acids

Question #2

Which molecules is not a carbohydrate?

A polysaccharide

B starch

C fatty acids

D disaccharide

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 RNA only

B neither DNA nor RNA

C DNA only

D both DNA and RNA

Question #5

Which statement about RNA is correct?

A RNA is made of amino acids.

B RNA is double-stranded.

C RNA is single-stranded.

D RNA contains thymine (T).

Question #6

One function of RNA molecules is to _____.

A copy DNA

B carry messages from DNA to ribosomes

C copy themselves

D pass genetic information to offspring

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 α-helix and β-pleated sheet

D order of amino acids

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 lipid molecules

B on the outside of the protein, interacting with water

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 quaternary

B primary

C secondary

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 α-helix or β-pleated sheet

B complex of multiple protein subunits (polypeptides)

C order of amino acids

D three-dimensional shape of the protein

Question #12

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

A secondary

B quaternary

C primary

D tertiary

Question #13

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

A tertiary

B secondary

C quaternary

D primary

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 liquid at room temperature

B are solid 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 nucleic acids

B carbohydrates

C proteins

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 starch

B proteins

C cellulose

D fats

Question #19

The structural polysaccharide, cellulose, is found in _____.

A animal cell membranes

B amyloplast, plant organelles that store carbohydrates

C bacterial cell walls

D plant 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 no bonds

B covalent bonds

C ionic bonds

D hydrogen bonds

Question #23

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

A functional group

B hydrocarbon

C polymer

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 2

B 1

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 1

C 100

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 decreases the pH

C acts as an acid

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 increasing the amount of carbonate ions

C increasing the H+ ion concentration

D decreasing the ocean temperature

Question #29

For water to evaporate, _____ must be broken.

A polar covalent bonds

B ionic bonds

C hydrogen bonds

D nonpolar covalent bonds

Question #30

Which bond or interaction is the strongest?

A van der Waals interaction

B hydrophobic interaction

C covalent bond

D hydrogen bond

Question #31

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

A atomic number

B number of protons + neutrons

C number of electrons

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 amu (daltons)

B approximately 8 amu (daltons)

C approximately 16 grams

D approximately 8 grams

Question #33

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

A 16 protons and 16 neutrons

B 16 neutrons

C 16 protons

D 8 protons and 8 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 use of DNA as the genetic material

B interaction with the environment

C ability to photosynthesize

D emergent properties

Question #36

A control group is _____.

A kept in an unchanging environment

B matched with the experimental group except for one variable

C left alone by the experiments

D exposed to several variables

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 enzymes are used by all cells

C there is a universal genetic code

D decomposers include both bacteria and fungi

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 natural selection

D a common ancestor

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 a community

B an organism

C a population

D a biosphere

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