Biology- Chemistry of Life Final Exam

Electrons

The subatomic particles / units which govern potential chemical reactions among elements are:

False

True or False: All the subatomic particles participate in chemical reactions.

False

True or False: Carbohydrates always contain protein.

True

True or False: Carbon is ideally suited to form covalent bonds.

True

True or False: Organic compounds form polymers.

True

True or False: Organic compounds usually contain many atoms.

False

True or False: Starch is a monosaccharide.

False

True or False: The four organic molecules found in organisms are carbohydrates, proteins, nucleic acids, and amino acids.

True

True or False: When fats decompose in an organism, energy is released.

Phospholipids

_______ help the cell membrane to conserve internal fluids.

B

Antibodies, certain hormones, and hemoglobin are all: A. fats B. proteins C. polysaccharides D. sucrose

carbohydrate

Is sugar a : nucleic acid, lipid, carbohydrate or protein

False

True or False: A hydrogen bond is completed by the transfer of its sole electron to another element.

Decomposition

A __________ reaction occurs when ionic or covalent bonds are broken and elements, ions, or simpler molecules are formed.

C

An atom that has 12 protons in its nucleus has an atomic number of: A. 24 B. 13 C. 12 D. none of the above

A

An enzyme is: A. a biological catalyst B. a biological reactant C. a biological product D. a biological co-factor

outer

In bonding of any type, the ________ level electrons are involved.

D

In the process of ionic bonding: A. the resulting molecule is always charged B. the resulting ions repel each other C. outer energy level electrons are shared D. out energy level electrons are gained and lost

inorganic

Ionic bonds usually hold _____ compounds together.

nucleic acid

Is DNA a : nucleic acid, lipid, carbohydrate or protein

lipid

Is cholesterol a : nucleic acid, lipid, carbohydrate or protein

protein

Is hemoglobin a : nucleic acid, lipid, carbohydrate or protein

decomposition

Starch being broke down into sugar in the body is a ____________ reaction.

liquid, gas

Water found in animal and human cells is most often found in the ________ phase of matter, and oxygen is found in the ______ phase of matter.

bases

When a substance dissociates into OH- ions, they are classified as _______.

A

Which statement correctly relates to DNA & RNA? A. RNA reads and translates the DNA code B. DNA synthesizes proteins C. DNA reads and translates the RNA code D. RNA contains the genetic code

D

A chemical reaction in your body in which bonds are broken is associated with: A. the storing of energy B. forming a giant molecule C. synthesis reaction D. the release of energy

speed up

Catalysts and enzymes are known to _______ _____ a chemical reaction, but not be consumed in the reaction.

deoxyribose, ribose

DNA is different from RNA in its function and also in its structure. DNA contains _____________ sugar and RNA contains ________ sugar.

C

Starch is made up of : A. polymer for nucleic acids B. simple proteins C. units of C6 H12 O6 D. amino acid polymers

Decomposition

The breakdown of a polysaccharide into monosaccharides is an example of ____________.

D

The decomposition reaction is: A. A+B AB B. none of the above C. AB+CD AD+BC D. AB A+B

A

What is necessary for reactants to combine chemically? A. input of energy B. release of energy C. must satisfy a reversible reaction D. equilibrium

A

When salts are dissolved in water: A. the components separate into ions B. they precipitate as compounds C. they sperate into component atoms D. they form acids and/or bases

A & D

Which 2 of these statements are true about carbohydrates: A, quick source of energy B. only source of fuel C. polymers formed by hydrolysis D. most are monosaccharides E. consists of carbon, hydrogen, and nitrogen

B & E

Which 2 of these statements are true about genetic codes: A. random data B. detailed instructions C. accidental complexity D. non functional chance information E. complex information

A & C

Which 2 of these statements are true: A compound consists of 2 or more distinct atoms B. A molecule is only found as the subunit of a compound C. A molecule may consist of 2 similar elements chemically bonded D. A compound consists of any 2 or more atoms chemically bonded

F

Which processes are involved in metabolism? A. synthesis, growth, repair B. decomposition, energy release C. reversible reactions, equilibrium D. synthesis and decomposition E. exchange reactions, control of PH F. all of the above

C

Which statement is correct? A. atomic weight is identical to atomic mass B. neutrons always equal the number of electrons C. electron of a neutral atom always equal the number of protons D. neutrons always equal the number of protons

C

Why can carbon bond to many elements simultaneously? A. because its +4 valence forms ionic bonds B. because it has a natural ionic charge of "+4" C. because it is capable of forming multiple covalent bonds