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Multiple Choice from pool Flashcards

1
Q

Which of the following terms can be used to refer to a structure of DNA in which the DNA is wrapped around protein cores and tightly coiled?

A

Selenoid

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2
Q

The following person(s) proposed that DNA consists of two helical strands:

A

Watson and Crick

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3
Q

The protein primary structure is held together by

A

Peptide Bonds

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4
Q

Which agents are used to denature proteins?

A

Strong Acid or Strong Base
High temperature
Organic Solvents

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5
Q

Which of the following statements must be true of a polyunsaturated fatty acid?

A

It has more than one double bond

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6
Q

Which of the following is not true about cellulose?

a. Partial hydrolysis produces cellobiose.
b. It stains blue-black in the presence of free iodine.
c. It is digested by microorganisms in termite digestive tracts.
d. It reacts with nitric acid.

A

b. It stains blue-black in the presence of free iodine.

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7
Q

Metabolic energy is generally released by

A

oxidizing reduced carbon atoms

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8
Q

Which of the following is responsible for the quaternary structure of proteins?

a. the number, kind and sequence of amino acids
b. hydrogen bonding along the peptide backbone
c. interactions between amino acid side chains
d. noncovalent bonds between subunits

A

noncovalent bonds between subunits

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9
Q

Which of the following is a narcotic?
a. epinephrine
b. pentobarbital
c. valium
d. cocaine

A

d. cocaine

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10
Q

Which compound has the highest boiling point?

A

Butylamine

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11
Q

Which of the following is not true about glucose?
a. It is also called blood sugar, grape sugar, and dextrose.
b. It does not require digestion.
c. It occurs in four enantiomeric forms.
d. It has four chiral carbons.

A

c. It occurs in four enantiomeric forms

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12
Q

1,3-Propanediamine is a (1,2,3 amine)

A

Primary amine

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13
Q

The common starch polymer which is not branched and forms a helical structure in solution is called

A

amylose.

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14
Q

The following fatty acid must be present in the human diet to maintain good health.

a. oleic acid
b. stearic acid
c. linoleic acid
d. palmitic acid

A

c. linoleic acid

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15
Q

What class of enzymes would catalyze the removal of groups from substrates by mechanisms other than hydrolysis?

a. lyase
b. oxidoreductase
c. hydrolyase
d. isomerase

A

a. lyase

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16
Q

Which if the following molecules will not hydrogen bond with other molecules of the same type?

a. CH3CH2NH2
b. (CH3CH2)2NH
c. (CH3CH2)3N
d. All of the molecules hydrog

A

c.(CH3CH2)3N - no H on it

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17
Q

Which of the following is a pentose?
a. ribose
b. galactose
c. fructose
d. mannose

A

a. ribose

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18
Q

Which of the following is the correct product(s) for the reaction below?

H2NCH2COOH + NaOH ——->

A

—> H2NCH2COO-Na+ + H2O

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19
Q

The lock-and-key model of enzyme action states the

A

the active site is the exact shape required to fit the substrate molecule and rigidly maintains this shape.

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20
Q

Which of the following occur when a monosaccharide is combined with concentrated sulfuric acid?

A

d. The sugar is dehydrated.

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21
Q

The following person(s) discovered nucleic acids

a. Watson and Crick.
b. Friedrich Miescher.
c. Maurice Wilkins.
d. Grego

a. Watson and Crick.

A

b. Friedrich Meischer

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22
Q

A molecule composed of guanine and deoxyribose is designated as
a.dGMP
b. dGM.
c. dG.
d. GTP.

a. dGMP.

23
Q

The fact that the enzyme hexokinase folds around its substrate, glucose, is an example explained by

A

Induced fit model

24
Q

Amines react with an acid such as HCl according to which of these equations?

a. CH3NH2 + HCl ⎯→ CH3NHCl + H2
b. CH3NH2 + HCl ⎯→ NHCl2 + CH4
c. CH3NH2 + HCl ⎯→ CH3NH3+Clˉ
d. CH3NH2 + 2 HCl ⎯→ CH4 + NH3 + Cl2

A

Correct
c. CH3NH2 + HCl ⎯→ CH3NH3+Clˉ

25
Q

A non-protein molecule that must be combined with a protein to produce an active enzyme is called a _____(i) _____. If this molecule is removed from the enzyme, the remaining protein part is called the _____ (ii) _____.

A

coenzyme
apoenzyme

26
Q

What is found in RNA?

A

Uracil, cytosine and guanine

27
Q

Which of the following is not true about collagen?

a. Each collagen protein is composed of 3 helices wrapped around each other.
b. Collagen provides support for bone, ligaments, tendons, and skin.
c. β-sheets form a barrel to provide additional support.
d. Collagen molecules resist stretching.

A

c. β-sheets form a barrel to provide additional support.

28
Q

Feedforward activation refers to a situation as described in which of the following statements?

A

The substrate for the first enzyme in a series (each operating on the product of the enzyme before it in the series) activates the enzymes in the series. Thus the enzymes are active only when the starting material is available.

29
Q

Which of the following represents an incorrect transcription from DNA to RNA?

a. guanine -> cytosine
b. thymine -> aadenine
c. cytosine -> guanine
d. uracil -> adenine

A

uracil -> adenine
Because AT the GC = its not A&T or G&C

30
Q

A complete protein must contain all of the following amino acids except

leucine
glycine
valine
tryptophan

31
Q

Cellulose is not a good food source for humans chiefly due to which of the following reasons?

A

Humans lack the enzyme needed to hydrolyse cellulose

32
Q

The most abundant organic chemical found in nature is

33
Q

What is the primary chemical function of enzymes in living systems?

A

Enzymes are the catalysts of biological reactions

34
Q

A large nonpolar molecule is likely to be

A

Hydrophobic

35
Q

An enzyme increases a reaction rate by orienting the reactants so the proper bonds will break and form. This statement defines

A

Productive binding hypothesis

36
Q

Before a dietary protein can be used to provide nutrition

A

the primary, secondary, tertiary, and quaternary structure of the protein must be destroyed.

37
Q

Which enzyme will give cotton fabric a soft appearance?

38
Q

Which of the following statements is not true about an enzyme-catalyzed reaction that is consistent with the lock-and-key hypothesis?

a. The enzyme attracts and binds the substrate.
b. The chemical reaction occurs in the active site.
c. The substrate must change shape to fit into the active site.
d. The enzyme-substrate intermediate decomposes to the enzyme and the product.

A

The substrate must change shape to fit into the active site.

39
Q

The following base sequence ACCUGA was observed in a strand of mRNA. What is the corresponding sequence in DNA from which this was transcribed?

40
Q

The common starch polymer which is not branched and forms a helical structure in solution is called

41
Q

Which of the following cannot be determined by electrophoretic techniques?

A

Primary structure

42
Q

In which of the following will heptanamine be the most soluble?

1.0 M NaOH

Pure Water

1.0 M HCl

1.0 M NaCl

43
Q

Which of the following is not an aromatic heterocyclic amine?

a. pyridine
b. piperidine
c. pyrimidine
d. all of these are aromatic heterocyclic amines.

A

b. piperidine

44
Q

Which of the following is not a redox coenzyme?

ATP
NADH
NADPH
FAD

45
Q

Bees have an enzyme known as invertase. This allows bees to split sugar into the following two monosaccharides

A

fructose and glucose

46
Q

Which substance has the highest boiling point?

Formamide
Acetamide
Propionamide
Benzamide

47
Q

An acetal structure in carbohydrates is also known as a(n)

48
Q

Which statement is true?

a. Hydrolysis of amides can be accomplished in the presence of a strong acid.

b. Hydrolysis of amides can be accomplished in the presence of a strong base.

c. The hydrolysis of amides is accomplished in living systems by enzymatic reactions.

A

All are true

49
Q

The model of tRNA that contains an anticodon loop on the bottom of the structure is described as a

a. single-stranded helix.
b. double-stranded helix.
c. solenoid.
d. cloverleaf.

A

Clover leaf

50
Q

Which of the following is not true about glucose?

a. It is also called blood sugar, grape sugar, and dextrose.
b. It does not require digestion.
c. It occurs in four enantiomeric forms.
d. It has four chiral carbons.

A

c. It occurs in four enantiomeric forms

51
Q

Which of the following compounds contains a carbonyl group?

    O
   ||
    C
  /    \    R        R a. aldotetrose b. ketopentose c. glyceraldehydes
52
Q

Which of the following is responsible for the secondary structure of proteins?

a. the number, kind and sequence of amino acids
b. hydrogen bonding along the peptide backbone
c. interactions between amino acid side chains
d. noncovalent bonds between subunits

A

b. hydrogen bonding along the peptide backbone

53
Q

What is an amphoteric substance?

A

A substance that can act as either an acid or base

Chem 2 (3 decks)

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