Q: During photosynthesis, which equation correctly represents the overall process by which plants synthesize carbohydrates?

$6CO_2 + 6H_2O + \text{sunlight} \rightarrow C_6H_{12}O_6 + 6O_2$

Question 1

Which of the following best describes the difference between an aldose and a ketose monosaccharide?

Accepted Answer

An aldose has a carbonyl group at the end of the carbon chain, while a ketose has a carbonyl group within the carbon chain.

Question 2

Which of the following is the correct general formula for a monosaccharide?

Accepted Answer

$C_nH_{2n}O_n$

Question 3

A biochemist isolates a carbohydrate with the formula $C_5H_{10}O_5$. Based on the number of carbons, how should this sugar be classified?

Accepted Answer

Pentose

Question 4

Which of the following statements about glycosidic linkages is correct?

Accepted Answer

Glycosidic linkages are covalent bonds formed between two monosaccharides by a dehydration reaction.

Question 5

Which polysaccharide is the primary structural component of plant cell walls?

Accepted Answer

Cellulose

Question 6

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack the enzyme to hydrolyze $\beta$-1,4-glycosidic linkages found in cellulose.

Question 7

Which of the following is a function of carbohydrates in cell identity?

Accepted Answer

They form glycolipids and glycoproteins that help cells recognize each other as 'self'.

Question 8

During photosynthesis, which equation correctly represents the overall process by which plants synthesize carbohydrates?

Accepted Answer

$6CO_2 + 6H_2O + 	ext{sunlight} ightarrow C_6H_{12}O_6 + 6O_2$

Question 9

Which of the following best describes the complementary relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in carbohydrates, while respiration releases that energy for cellular work.

Question 10

A patient is diagnosed with a genetic disorder that prevents the formation of glycoproteins on red blood cells. Which of the following is a likely consequence?

Accepted Answer

The patient's immune system may not recognize their own red blood cells, leading to autoimmune reactions.

Question 11

Which of the following is a correct statement about the structure of starch and glycogen?

Accepted Answer

Both are composed of $\alpha$-glucose monomers joined by $\alpha$-1,4-glycosidic linkages.

Question 12

Which of the following best explains why dietary fiber is important for digestive health?

Accepted Answer

Dietary fiber consists of polysaccharides like cellulose that cannot be digested, helping to move material through the digestive tract.

Question 13

A scientist is studying a polysaccharide that forms parallel strands joined by hydrogen bonds. Which polysaccharide is she most likely studying?

Accepted Answer

Cellulose

Question 14

Which of the following is a correct description of a disaccharide?

Accepted Answer

A molecule formed by two monosaccharides joined by a glycosidic linkage.

Question 15

Which of the following is a real-life example of carbohydrate function in cell recognition?

Accepted Answer

ABO blood group antigens on red blood cells are specific glycolipids.

Question 16

Which of the following best explains the energy storage role of carbohydrates in animals?

Accepted Answer

Animals store energy in the form of glycogen, a highly branched polysaccharide.

Question 17

Which of the following best describes the process by which energy stored in glucose is used to make ATP in cells?

Accepted Answer

Cellular respiration breaks down glucose in the presence of oxygen to produce ATP, water, and carbon dioxide.

Question 18

Which of the following is a correct multi-step pathway involving carbohydrates in living organisms?

Accepted Answer

Photosynthesis converts $CO_2$ and $H_2O$ into glucose, which is then broken down by cellular respiration to produce ATP.

Chapter 5: Carbohydrates – Structure, Function, and Biological Roles

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