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BIOCHEM Midterm Exam 2 Questions and Correct Answers.
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BIOCHEM Midterm Exam 2 Questions and Correct Answers. BIOCHEM Midterm Exam 2 Questions and Correct Answers.
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BIOCHEM Midterm Exam 2 Questions and Correct Answers.When monosaccharides cyclize they form:
a) enantiomers
b) D- and L forms
c) ester bonds
d) alpha and beta annoyers
e) chair and boat forms - Correct answer alpha and beta annoyers
Which of these pairs of carbohydrates are epimerase?
a) glucose and galactose
b) alpha-glucose and beta-glucose
c) D-glucose and L-glucose
d) cellulose and calaboose
e) glucose and lactose - Correct answer glucose and galactose
In DNA and RNA, the bases and monosaccharide units are linked to each other by:
a) amide bonds
b) O-Glyosidic bonds
c) N-glyosidic bonds
d) acetyl bonds
e) savings bonds - Correct Answer N-glyosidic bonds
The aldotetroses have two asymmetric centers and ______ stereoisomers.
a) 2
b) 4
c) 8
d) 16
e) 32 - Correct answer 4
Which of the following is NOT a common characteristic of most of the fatty acids that are present in the cell membrane?
a) they are all highly saturated
b) they tend to be liquid at body temperature
c) they have relatively higher molecular weights (16-24 carbon atoms)
d) they often have even numbers of carbon atoms
e) they are often unsaturated or polyunsaturated - Correct answer they are all highly saturated Which process converts unsaturated fats to saturated fats:
a) acetylation
b) oxidation
c) hydrogenation
d) hydrolysis
e) dehydration - Correct answer hydrogenation
The phosphoglycerols do NOT contain _____.
a) sphingosine
b) phosphate
c) choline
d) glycerol
e) fatty acid - Correct answer sphingosine
The saturated fatty acids:
a) lower cholesterol levels in humans and prevent atherosclerosis
b) some of them cannot be degraded by humans
c) they generally need to be provided in the diet
d) they are often solid at body temperature and have much higher melting
points than the corresponding unsaturated fatty acids
e) they are usually not found in triacylglycerol compounds - Correct answer they are often solid at body temperature and have much higher melting points than the corresponding unsaturated fatty acids
The lipids in biological membranes are mostly:
a) phospholipids and cholesterol
b) triacylglycerol’s and cholesterol
c) triacylglycerol’s and phospholipids
d) fatty acids and triacylglycerol’s
e) fatty acids and polyisoprenoids - Correct answer phospholipids and cholesterol
Which monosaccharide units are found in DNA?
a) glucose
b) fructose
c) ribose
d) 2-deoxyribose
e) mannose - Correct answer 2-deoxyribose
What generally happens as an enzyme is purified?
a) The specific activity decreases
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