Question 1

In an x-ray film of the skeletal system, the dense tissue areas appear ________ because they ________ the x-rays; the less dense tissues appear ________ because they ________ the x-rays.

Accepted Answer

A)   light; absorb; dark; do not absorb
B)   dark; absorb; light; do not absorb
C)   light; do not absorb; dark; absorb
D)   dark; do not absorb; light; absorbE) C) and D)
F) All of the above

Question 2

In order to get energy (ATP)  from food molecules in the final stage of respiration, humans require ________.

Accepted Answer

A)   oxygen
B)   sodium
C)   carbon dioxide
D)   riboseE) None of the above
F) All of the above

Question 3

Electrolytes are substances that

Accepted Answer

A)   form covalent bonds with water.
B)   conduct electricity when dissolved in water.
C)   cannot conduct electricity in solution.
D)   are NOT found in the human body in any appreciable amounts.
E)   are NOT charged particles.F) None of the above
G) A) and E)

Question 4

All of the following terms relate to lipids. Which does not belong with the other four?

Accepted Answer

A)   Cholesterol
B)   Estrogen
C)   Steroid
D)   Triglyceride
E)   Bile saltsF) A) and C)
G) B) and C)

Question 5

Which of the following is a component of a nucleotide?

Accepted Answer

A)   Adenine - a nitrogen base
B)   Glucose - a monosaccharide
C)   Cholesterol - a steroid
D)   Calcium ions
E)   ATPF) A) and D)
G) B) and E)

Question 6

Isotopes of the same element have

Accepted Answer

A)   the same number of neutrons but different numbers of protons.
B)   different numbers of protons and electrons.
C)   the same mass number.
D)   the same atomic number but differ in their mass numbers.
E)   no mass number.F) A) and B)
G) B) and E)

Question 7

Na (atomic no. 11)  reacts with Cl (atomic no. 17)  to become stable. In the reaction, Na will ________, while Cl will ________.

Accepted Answer

A)   accept one electron; give up one electron
B)   give up one proton; accept one proton
C)   share one electron with chlorine; share one electron with sodium
D)   become an anion; become a cation
E)   give up one electron; accept one electronF) D) and E)
G) None of the above

Question 8

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "A"?

Accepted Answer

A)   Hydrogen bond
B)   Water molecule
C)   Oxygen atom
D)   Hydrogen atom
E)   Polar covalent bondF) C) and D)
G) A) and C)

Question 9

A cation is

Accepted Answer

A)   a combination of atoms held together by chemical bonds.
B)   a positively charged ion.
C)   a negatively charged ion.
D)   a molecule that conducts electricity when placed in solution.
E)   an alteration in the three-dimensional structure of a protein.F) A) and B)
G) B) and D)

Question 10

Triglycerides are composed of

Accepted Answer

A)   monosaccharides.
B)   amino acids.
C)   nucleotides.
D)   glycerol and fatty acids.
E)   None of the choices are correct.F) D) and E)
G) A) and D)

Question 11

Inorganic chemists study substances ________ carbon, while organic chemists study substances ________ carbon.

Accepted Answer

A)   lacking; containing
B)   containing; lacking
C)   containing more than 1 mole of; with less than a mole ofD) All of the above
E) A) and B)

Question 12

Arrange the following from largest to smallest:
(1)  Nucleus
(2)  DNA molecule
(3)  Skin cell
(4)  Chicken eggs

Accepted Answer

A)   1, 2, 3, 4
B)   4, 3, 1, 2
C)   3, 4, 2, 1
D)   2, 3, 1, 4
E)   4, 2, 3, 1F) A) and E)
G) B) and E)

Question 13

Which of the following means a change in shape of a protein?

Accepted Answer

A)   Amino acid
B)   Peptide bond
C)   Primary structure of protein
D)   Secondary structure of protein
E)   DenaturationF) B) and D)
G) C) and D)

Question 14

DNA

Accepted Answer

A)   must travel to ribosomes to function.
B)   contains the sugar deoxyribose.
C)   is a single-stranded molecule.
D)   is one of several amino acids.
E)   assembles amino acids to make proteins.F) None of the above
G) A) and D)

Question 15

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "B"?

Accepted Answer

A)   Hydrogen bond
B)   Water molecule
C)   Oxygen atom
D)   Hydrogen atom
E)   Polar covalent bondF) B) and E)
G) A) and B)

Question 16

Solution A has a pH of 10, and solution B has a pH of 2. Which of the following statements about these solutions is true?

Accepted Answer

A)   Solution A and solution B are both basic.
B)   Solution B is basic.
C)   Solution A is acidic.
D)   Solution B has a higher H+ concentration than solution A.
E)   Solution A has a higher H+ concentration than solution B.F) A) and D)
G) A) and E)

Question 17

Normal pH range for blood is 7.35 to 7.45. If blood pH falls below 7.35,

Accepted Answer

A)   an imbalance called alkalosis results.
B)   nothing happens as this is an acceptable deviation.
C)   an imbalance called acidosis results.
D)   the blood becomes saltier.
E)   the number of red blood cells decreases.F) B) and C)
G) A) and B)

Question 18

The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 1023 molecules is a/an ________.

Accepted Answer

A)   mole
B)   molarity
C)   ion
D)   atomic mass unitE) None of the above
F) A) and B)

Question 19

The molecule used most frequently by cells as a fuel belongs to which of the following groups?

Accepted Answer

A)   Prostaglandins
B)   Carbohydrates
C)   Nucleic acids
D)   Steroids
E)   PhospholipidsF) A) and B)
G) All of the above

Question 20

Proteins

Accepted Answer

A)   are the body's source of immediate energy.
B)   are the building blocks of nucleotides.
C)   provide much of the structure of body cells and tissues.
D)   contain the genetic information of the cell.
E)   insulate and cushion the body.F) C) and E)
G) B) and D)

Exam 2: The Chemical Basis of Life

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "B"?

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All of the following terms relate to lipids. Which does not belong with the other four?

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In an x-ray film of the skeletal system, the dense tissue areas appear ________ because they ________ the x-rays; the less dense tissues appear ________ because they ________ the x-rays.

Correct AnswerverifiedShow Answer

In order to get energy (ATP) from food molecules in the final stage of respiration, humans require ________.

Correct AnswerverifiedShow Answer

Electrolytes are substances that

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The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 1023 molecules is a/an ________.

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Solution A has a pH of 10, and solution B has a pH of 2. Which of the following statements about these solutions is true?

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Na (atomic no. 11) reacts with Cl (atomic no. 17) to become stable. In the reaction, Na will ________, while Cl will ________.

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The molecule used most frequently by cells as a fuel belongs to which of the following groups?

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-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "A"?

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Normal pH range for blood is 7.35 to 7.45. If blood pH falls below 7.35,

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Triglycerides are composed of

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Arrange the following from largest to smallest: (1) Nucleus (2) DNA molecule (3) Skin cell (4) Chicken eggs

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A cation is

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Proteins

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Isotopes of the same element have

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Which of the following means a change in shape of a protein?

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DNA

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Which of the following is a component of a nucleotide?

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Inorganic chemists study substances ________ carbon, while organic chemists study substances ________ carbon.

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In an x-ray film of the skeletal system, the dense tissue areas appear because they the x-rays; the less dense tissues appear because they the x-rays.

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The mass of a chemical equal to its molecular weight in grams, containing 6.023 x 10²³ molecules is a/an ________.

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Na (atomic no. 11) reacts with Cl (atomic no. 17) to become stable. In the reaction, Na will , while Cl will .

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Inorganic chemists study substances carbon, while organic chemists study substances carbon.

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