Question 1

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Their fatty acid tails are hydrophobic and face inward, while the phosphate heads are hydrophilic and face outward toward water.

Question 2

A scientist is studying a molecule that is a linear, nitrogen-containing carbohydrate found in the exoskeleton of crabs. Which molecule is she most likely studying?

Accepted Answer

Chitin

Question 3

Which of the following statements about the structure and function of carbohydrates is correct?

Accepted Answer

Chitin and cellulose provide structural support, while starch and glycogen are used for energy storage.

Question 4

During digestion, phospholipids help to emulsify other fats. What property of phospholipids allows them to perform this function?

Accepted Answer

They have both hydrophobic and hydrophilic regions, allowing them to interact with both water and fats.

Question 5

Which of the following best describes the orientation of phospholipids in a cell membrane?

Accepted Answer

Phosphate heads face both the inside and outside of the cell, while fatty acid tails face each other.

Question 6

Which of the following equations best represents the general structure of a phospholipid?

Accepted Answer

$$\mathrm{Glycerol} + 2\ \mathrm{Fatty\ Acids} + \mathrm{Phosphate\ Group}$$

Question 7

A mutation causes an organism to produce a branched carbohydrate for its exoskeleton instead of a linear one. Which of the following is a likely consequence?

Accepted Answer

The exoskeleton may lose structural integrity because chitin is normally linear.

Question 8

Which of the following is a key difference between starch and chitin?

Accepted Answer

Chitin contains nitrogen and is linear, while starch is used for energy storage and is branched.

Question 9

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

Their amphipathic nature allows them to form a bilayer that separates the cell from its environment while allowing selective transport.

Question 10

Which of the following is a function of carbohydrates that is NOT shared by lipids?

Accepted Answer

Structural support and protection

Question 11

A patient is found to have a genetic disorder that prevents the synthesis of chitin. Which of the following organisms would be most affected by this disorder?

Accepted Answer

Arthropods such as insects and crabs

Question 12

Which of the following best describes the role of the phosphate group in a phospholipid?

Accepted Answer

It is hydrophilic and interacts with aqueous environments.

Question 13

Which of the following best explains why chitin is classified as a modified carbohydrate?

Accepted Answer

It contains nitrogen in addition to carbon, hydrogen, and oxygen.

Question 14

Which of the following is a correct comparison between the functions of phospholipids and carbohydrates?

Accepted Answer

Phospholipids form cell membranes, while carbohydrates can provide both energy storage and structural support.

Question 15

Which of the following best describes the molecular arrangement in a phospholipid bilayer?

Accepted Answer

Hydrophilic heads face the aqueous environments on both sides, while hydrophobic tails face each other in the interior.

Molecules of Microbiology: Lipids and Carbohydrates

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