Question 1

Apricots have a pH of 3.8.Therefore,they are ______.
or

Accepted Answer

The answer of Apricots have a pH of 3.8.Therefore,they are...

Question 2

An atom with 10 protons and which has lost 2 electrons is electrically neutral.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following isotopes has the longest half-life?

Accepted Answer

A)  Iodine-131
B)  Iron-59
C)  Phosphorus-32
D)  Cobalt-60

Question 4

The atomic weight of an element whose atoms contain 8 protons,8 electrons,and 8 neutrons is

Accepted Answer

A)  8.
B)  16.
C)  24.
D)  32.

Question 5

A biomarker is

Accepted Answer

A)  a gene that encodes a particular protein.
B)  always a protein.
C)  a body chemical associated with a particular disease or exposure to a toxin.
D)  any chemical in the body.

Question 6

In a covalent bond

Accepted Answer

A)  one atom loses and another atom gains electrons.
B)  atoms share a pair or more of electrons.
C)  oppositely charged atoms attract.
D)  like-charged atoms repel.

Question 7

Chemistry is important to the study of physiology because

Accepted Answer

A)  the foods that we eat are chemicals.
B)  body functions depend on cellular functions that reflect chemical changes.
C)  chemical reactions enable our bodies to extract energy from nutrients.
D)  all of the above.

Question 8

The parts of an atom that carry single negative electrical charges are called ________.

Accepted Answer

The answer of The parts of an atom that carry...

Question 9

A phospholipid differs structurally from a triglyceride in that it has three phosphate groups attached to the glycerol molecule rather than three fatty acid chains.

Accepted Answer

A) True 
 B)False

Question 10

Synthesis reactions are particularly important in the body for

Accepted Answer

A)  release of energy.
B)  digestion of food products.
C)  growth of body parts.
D)  neutralization of acids by buffers.

Question 11

Cholesterol,a type of lipid,is composed of 3 fatty acid chains attached to glycerol.

Accepted Answer

A) True 
 B)False

Question 12

Atomic radiation is useful for treating cancer because

Accepted Answer

A)  radiation affects cancer cells but not normal cells.
B)  radiation protects normal cells against the effects of cancer.
C)  radiation harms cancer cells more readily than it does most non-cancer cells.
D)  normal cells are not affected by radiation.

Question 13

Carbon can form ___ covalent bonds.

Accepted Answer

A)  1
B)  2
C)  4
D)  8

Question 14

Sodium and chloride atoms combine readily because they both lose electrons.

Accepted Answer

A) True 
 B)False

Question 15

A substance that releases hydrogen ions in water is a base.

Accepted Answer

A) True 
 B)False

Question 16

The formula H2O refers to

Accepted Answer

A)  Two hydrogen molecules and one oxygen molecule.
B)  One hydrogen molecule and two oxygen molecules.
C)  A molecule that contains two hydrogen atoms and one oxygen atom.
D)  A molecule that contains one hydrogen atom and two oxygen atoms.

Question 17

Exposure to ionizing radiation may

Accepted Answer

A)  cloud the lens of the eye.
B)  cause cancer.
C)  interfere with normal growth.
D)  all of the above.

Question 18

The opposite of a decomposition reaction is a _____ reaction.

Accepted Answer

The answer of The opposite of a decomposition reaction is...

Question 19

The atoms of different elements have

Accepted Answer

A)  the same atomic number and same atomic weight.
B)  the same atomic number but different atomic weights.
C)  different atomic numbers.
D)  different atomic numbers but the same number of electrons.

Question 20

The parts of a protein that change when it denatures are

Accepted Answer

A)  the primary and secondary structures.
B)  the secondary and tertiary structures.
C)  the amino acid sequence and the secondary structure.
D)  the tertiary and quaternary structures.

Exam 2: Chemical Basis of Life

In a covalent bond

Correct AnswerverifiedShow Answer

The opposite of a decomposition reaction is a _____ reaction.

Correct AnswerverifiedShow Answer

Sodium and chloride atoms combine readily because they both lose electrons.

Correct AnswerverifiedShow Answer

Atomic radiation is useful for treating cancer because

Correct AnswerverifiedShow Answer

An atom with 10 protons and which has lost 2 electrons is electrically neutral.

Correct AnswerverifiedShow Answer

Exposure to ionizing radiation may

Correct AnswerverifiedShow Answer

A substance that releases hydrogen ions in water is a base.

Correct AnswerverifiedShow Answer

The parts of an atom that carry single negative electrical charges are called ________.

Correct AnswerverifiedShow Answer

Which of the following isotopes has the longest half-life?

Correct AnswerverifiedShow Answer

Carbon can form ___ covalent bonds.

Correct AnswerverifiedShow Answer

A biomarker is

Correct AnswerverifiedShow Answer

A phospholipid differs structurally from a triglyceride in that it has three phosphate groups attached to the glycerol molecule rather than three fatty acid chains.

Correct AnswerverifiedShow Answer

Apricots have a pH of 3.8.Therefore,they are ______. or

Correct AnswerverifiedShow Answer

Cholesterol,a type of lipid,is composed of 3 fatty acid chains attached to glycerol.

Correct AnswerverifiedShow Answer

Chemistry is important to the study of physiology because

Correct AnswerverifiedShow Answer

The atoms of different elements have

Correct AnswerverifiedShow Answer

The parts of a protein that change when it denatures are

Correct AnswerverifiedShow Answer

The atomic weight of an element whose atoms contain 8 protons,8 electrons,and 8 neutrons is

Correct AnswerverifiedShow Answer

The formula H2O refers to

Correct AnswerverifiedShow Answer

Synthesis reactions are particularly important in the body for

Correct AnswerverifiedShow Answer

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The formula H₂O refers to

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