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NU624 2nd Exam Practice Questions and Answers
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NU624 2nd Exam Practice Questions and Answers B. Haworth projections -Aldehydes react with alcohols to form hemiacetals, and ketones react with alcohols to form hemiketals—when this intramolecular reaction occurs, the linear monosaccharide forms a cyclic structure -The cyclic structures are...

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  • October 24, 2024
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  • 2024/2025
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FIRST PUBLISH OCTOBER 2024




NU624 2nd Exam Practice Questions and
Answers

B. Haworth projections


-Aldehydes react with alcohols to form hemiacetals, and ketones react with alcohols to form

hemiketals—when this intramolecular reaction occurs, the linear monosaccharide forms a cyclic

structure


-The cyclic structures are called Haworth projections


-Lower horizontal bond in the ring is projected toward you, above the plane of the page, and the upper

horizontal bond is projected away from you, behind the plane of the page


-Cyclization leads to the formation of two possible stereoisomers called anomers


-A six-membered cyclic sugar is called a pyranose, and a five-membered sugar ring is called a furanose -

Ans:✔✔-The cyclic structures of sugars are called


A. Chirality


B. Haworth projections



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C. Fischer projections


D. Aromatic structure


A. Starch


Common disaccharides


-Maltose, or malt sugar, is formally named α-D-glucopyranosyl [1↔4]


β-D-glucopyranose


-Cellobiose contains two glucose molecules joined by a beta glycoside bond and is formally named β-D-

glucopyranosyl [1↔4] β-D-glucopyranose


-Lactose contains a galactose residue joined by a beta glycoside bond to a glucose residue


-Sucrose contains an alpha glucose joined to a beta fructose, and is formally named


α-D-glucopyranosyl [1↔2] β-D-fructofuranoside - Ans:✔✔-Which of the following is not a disaccharide


A. Starch


B. Lactose


C. Sucrose


D. Maltose

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C. Cellobiose


Polysaccharides


-Cellulose is poly [1↔4] β-glucose with beta glycoside bonds


-Starch is poly [1↔4] α-glucose with alpha glycoside bonds


-Chains of starch molecules can branch by forming [1↔6] glycoside bonds, which leads to more

compact forms of starch, such as glycogen and amylopectin - Ans:✔✔-Which of the following is not a

polysaccharide


A. Cellulose


B. Starch


C. Cellobiose


D. None of the above


D. None of the above


-In an alpha glycoside bond, the linking oxygen atom is pointed up, in the alpha position


-In a beta glycoside bond, the linking oxygen atom is pointed down, in the beta position


-Acetal and ketal bonds that connect monosaccharides into disaccharides



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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




-All of the above - Ans:✔✔-Which of the following statement is false


A. In an alpha glycoside bond, the linking oxygen atom is pointed up, in the alpha position


B. In a beta glycoside bond, the linking oxygen atom is pointed down, in the beta position


C. Acetal and ketal bonds that connect monosaccharides into disaccharides


D. None of the above


B. Proteins


-Proteins—polymers of amino acids, which contain an amine functional group and a carboxylic acid

functional group - Ans:✔✔-Organic molecule that contains polymers of amino acids, which contain an

amine functional group and a carboxylic acid functional group


A. Carbohydrates


B. Proteins


C. Nucleic Acids


D. Lipids


C. Nucleic Acids




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