biochem quizzes part 1

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created 3 years ago by morganlynn1224
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1

a reaction is said to be at equilibrium when the forward reaction is exactly balanced by the reverse process

true

2

hydrophobic effect promotes the folding of proteins in water

true

3

ice has higher density than liquid water

false

4

ice has lower density than liquid water

true

5

electrostatic interactions form the basis of van der waals forces and hydrogen bonding but not ionic interactions

false

6

hydrogen bonding and dipole-dipole interactions are examples of van der waals forces

true

7

a reaction is said to be at steady state when the forward reaction is exactly balanced by the reverse process

false

8

the 1st law of thermodynamics states that the natural processes are spontaneous (ΔS > 0)

false

9

a reaction is said to be under entropic control if ΔH > 0 and TΔS < 0

false

10

the pH of a solution is defined by the equation pH=log[H+] where [H+] is the molar concentration of hydrogen ions

false

11

monosaccharides that adopt a 6-membered cyclic form are called furanoses

false

12

two stereoisomers with multiple chiral centers are epimers if they harbor different configuration at one or more chiral centers but not all

false

13

D-glucose is an epimer of D-fructose

true

14

deoxyribose sugar differs from ribose in that the latter harbors an hydroxyl (-OH) group at C2

true

15

oxidation of the terminal aldehyde (-CHO) group @ C1 of an aldose generates alduronic acid

false

16

oxidation of the terminal aldehyde (-CHO) group @ C1 of an aldose generates aldonic acid

true

17

oxidation of the terminal alcohol (-CH2OH) group @ C6 of an aldose generates alduronic acid

true

18

a-D-galactose and B-D-galactose are enantiomers

false

19

D-ribulose (linear form) represents one of 4 stereoisomers

true

20

oxidation of the terminal alcohol (-CH2OH) group @ C6 of an aldose generates aldonic acid

false

21

monosaccharides that adopt a 6-membered cyclic form are called pyranoses

true

22

monosaccharides that adopt a 6-membered cyclic form are called furanoses

false

23

monosaccharides that adopt a 5-membered cyclic form are called furanoses

true

24

alcoholic beverages are rich in sucrose

false

25

cellulose is a polysaccharide comprised of repeating D-glucose units

true

26

glycogen is a linear polysaccharide

false

27

glycogen is a branched polysaccharide

true

28

glycogen is comprised of a mixture of polysaccharides called amylose and amylopectin

false

29

starch is comprised of a mixture of polysaccharides called amylose and amylopectin

true

30

hyaluronan acts as an anti-coagulant to prevent the formation of blood clots in arteries

false

31

heparin acts as an anti-coagulant to prevent the formation of blood clots in arteries

true

32

trehalose plays a central role in anaerobiosis

false

33

chitin serves as a storage polysaccharide in many animals

false

34

chitin serves as a structural polysaccharide in many animals

true

35

starch serves as a storage polysaccharide in many plants

true

36

glycogen serves as a storage polysaccharide in many animals

true

37

in terms of its 3D structure, glycogen adopts a coiled-coil conformation

true

38

in terms of its 3D structure, starch adopts a coiled-coil conformation

true

39

in terms of its 3D structure, chitin adopts a coiled-coil conformation

false

40

in terms of its 3D structure, cellulose adopts a coiled-coil conformation

false

41

heated milk is rich in lactulose

true

42

starch is a polysaccharide comprised of repeating D-glucose units

true

43

glycogen is comprised of a mixture of polysaccharides called amylose and amylopectin

false

44

maltose is a disaccharide formed via an O-glycosidic linkage between D-galactose and D-glucose

false

45

lactose is a disaccharide formed via an O-glycosidic linkage between D-galactose and D-glucose

true

46

maltose is a disaccharide formed via an O-glycosidic linkage between D-glucose and D-glucose

true

47

lactulose is a disaccharide formed via an O-glycosidic linkage between D-galactose and D-glucose

false

48

lactulose is a disaccharide formed via an O-glycosidic linkage between D-galactose and D-fructose

true

49

trehalose is a disaccharide formed via an O-glycosidic linkage between D-galactose and D-glucose

false

50

trehalose is a disaccharide formed via an O-glycosidic linkage between D-glucose and D-glucose

true

51

heated milk is rich in lactulose

true

52

heated milk is rich in lactose

false

53

glycogen is the principal fuel storage or energy reservoir in plants

false

54

glycogen is the principal fuel storage or energy reservoir in animals

true

55

starch is the principal fuel storage or energy reservoir in plants

true

56

starch is the principal fuel storage or energy reservoir in animals

false

57

in terms of its 3D structure, starch adopts a coiled-coil conformation

true

58

the ability of many organisms to withstand prolonged periods of dehydration is largely owed to trehalose

true

59

glycogen is a linear polysaccharide

false

60

Cerebrosides are distinguished from other sphingolipids in that they harbor a monosaccharide

true

61

Examples of phospholipids include cerebrosides and gangliosides

false

62

Steroid hormones are lipophilic

true

63

Examples of sphingolipids include phosphatidylcholine and phosphatidylinositol

false

64

Gangliosides are distinguished from other sphingolipids in that they harbor a monosaccharide

false

65

The melting point (mp) of fatty acids increases with increasing the length of fatty acid chains

true

66

The melting point (mp) of fatty acids decreases with increasing the length of fatty acid chains

false

67

The melting point (mp) of fatty acids decreases with decreasing the length of fatty acid chains

true

68

Steroid hormones serve as a precursor for the biosynthesis of cholesterol

false

69

The melting point (mp) of fatty acids increases with increasing the degree of saturation

true

70

The melting point (mp) of fatty acids decreases with increasing the degree of saturation

false

71

Steroid hormones are hydrophilic

false

72

A lipid comprised of a glycerol moiety esterified to three fatty acids is called phospholipid

false

73

Sialic acid is an integral component of cerebrosides

false

74

Sialic acid is an integral component of gangliosides

true

75

A fatty acid with the symbolic nomenclature 16:3 represents one of 3 stereoisomers

false

76

Examples of sphingolipids include cerebrosides and gangliosides

true

77

The melting point (mp) of fatty acids decreases with increasing the number of C=C bonds

true

78

The melting point (mp) of fatty acids increases with increasing the number of C=C bonds

false

79

A lipid comprised of a glycerol moiety esterified to three fatty acids is called tryglyceride

true

80

examples of phospholipids include phosphatidylcholine and phosphatidylinositol

true

81

a fatty acid with the symbolic nomenclature 16:4 harbors an hydrocarbon chain comprised of a total of 20 carbon atoms

false

82

gangliosides are distinguished from other sphingolipids in that they harbor a oligosaccharide

true

83

steroid hormones are hydrophilic

false

84

a lipid comprised of a glycerol moiety esterified to three fatty acids is called a phospholipid

false

85

the glucose transporter (GLUT1) is an integral membrane protein

true

86

the Na+/glucose symporter accelerates the downhill movement of glucose into the epithelial cells lining the small intestine

false

87

the integral membrane protein KcsA that mediates the transport of ions across biological membranes can be best described as a porin channel

false

88

in the context of transit across biological membranes, passive transport results in a decrease in overall entropy

false

89

in the context of transit across biological membranes, passive transport results in a increase in overall entropy

true

90

the Na+/K+ antiporter requires an input of external energy in the form of a coupled discharge of an ion gradient

false

91

passive transport is the prime route involved in the diffusion across biological membranes of testosterone

true

92

gramicidin A preferentially transports K+ ion across biological membranes

true

93

valinomycin preferentially transports K+ ion across biological membranes

false

94

the Na+/glucose symporter requires an input of external energy in the form of a directly-coupled ATP hydrolysis

false

95

in addition to glucose, the glucose transporter (GLUT1) can also mediate the membrane transit of other closely-related aldoses

true

96

the integral membrane protein OmpF that mediates the transport of small molecules across biological membranes can be best described as a porin channel

true

97

the Ca2+ antiporter requires an input of external energy in the form of a coupled discharge of an ion gradient

false

98

the integral membrane protein KcsA that mediates the transport of ions across biological membranes can be best described as an ion channel

true

99

the glucose transporter (GLUT1) mediates the membrane transit of glucose as well as vitamin D

false

100

the Na+/K+ antiporter requires an input of external energy in the form of a coupled discharge of an ion gradient

false

101

the membrane topology of glucose (GLUT1) can be best described as a 7-transmembrane a-helical bundle

false

102

a depsipeptide is a peptide that harbors a mixture of amide and ether linkages

false

103

the glucose transporter (GLUT1) operates as an allosterically-gated transport channel or tunnel

true

104

in the context of transit across biological membranes, facilitated transport occurs via specific transmembrane channels of carriers

true

105

G-protein coupled receptors (GPCRs) harbor a single-transmembrane topological fold

false

106

estradiol exerts its effect by virtue of its ability to bind to a steroid hormone receptor (SHR)

true

107

glucagon exerts its effect by virtue of its ability to bind to a G-protein coupled receptor (GPCR)

true

108

insulin is an endocrine hormone that is released via a duct into the liver

false

109

estradiol exerts its effect by virtue of its ability to bind to a cell-surface membrane receptor

false

110

examples of endocrine glands include adrenal glands and islets of langerhans

true

111

estradiol is secreted by the ovaries

true

112

insulin is secreted by the pancreas

true

113

testosterone is a member of androgens

true

114

estradiol is primarily secreted by the testes

false

115

estradiol is a member of estrogens

true

116

insulin is secreted by the thyroid glands

false

117

aldosterone is secreted by the thyroid glands

false

118

activation of G-protein coupled receptors (GPCRs) results in the production of triglycerol

false

119

insulin is an endocrine hormone that is directly secreted into the bloodstream

true

120

cortisol is secreted by the thyroid glands

false

121

estradiol exerts its effect by virtue of its ability to bind to a G-protein coupled receptor (GPCR)

false

122

insulin is an endocrine hormone that is secreted in response to low blood glucose level

false

123

glucagon is an endocrine hormone that is secreted in response to low blood glucose level

true

124

glucagon is an endocrine hormone that is secreted in response to high blood glucose level

false

125

insulin is an endocrine hormone that is secreted in response to high blood glucose level

true

126

a primary amide harbors an -NH2 group

false

127

in the metric system, the unit prefix GIGA denotes a factor of 1012

false