Question 1

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) C) and D)
G) A) and E)

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) B) and D)
F) A) and D)

Question 3

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) A) and E)
G) A) and C)

Question 4

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) C) and D)
G) A) and C)

Question 5

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 D)
G) B) and D)

Question 6

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 7

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 E)
G) A) and C)

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 "B"?

Accepted Answer

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

Question 9

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) B) and D)
F) A) and B)

Question 10

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) B) and E)
G) D) and E)

Question 11

-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) B) and E)

Question 12

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) D) and E)

Question 13

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) C) and D)
G) A) and E)

Question 14

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 C)
G) None of the above

Question 15

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) None of the above
G) A) and E)

Question 16

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) A) and B)
E) None of the above

Question 17

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) B) and C)
F) A) and C)

Question 18

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) A) and C)
G) A) and E)

Question 19

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) D) and E)
G) A) and D)

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) A) and E)
G) A) 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 "A"?

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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 "B"?

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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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Proteins

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Isotopes of the same element have

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

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

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

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Which of the following is a component of a nucleotide?

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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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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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DNA

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

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Triglycerides are composed of

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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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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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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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