Question 1

Which of the following best describes the hierarchical organization of biological structures in multicellular organisms, from smallest to largest?

Accepted Answer

Organelles → Cells → Organs → Organ Systems → Organism

Question 2

A scientist is using a microscope to study the surface of a pollen grain in high detail. Which type of microscope should they use and why?

Accepted Answer

Scanning electron microscope (SEM), because it provides detailed images of cell surfaces using electron beams.

Question 3

Which of the following statements about macromolecules is correct?

Accepted Answer

Proteins, nucleic acids, and polysaccharides are considered macromolecules because they are large polymers made of repeating monomers.

Question 4

Which chemical reaction is responsible for joining monomers to form polymers, and what is a byproduct of this reaction?

Accepted Answer

Dehydration reaction; water is released as a byproduct.

Question 5

A patient is diagnosed with a genetic disorder that prevents the breakdown of glycogen in liver cells. Which process is most directly affected?

Accepted Answer

Hydrolysis of polysaccharides to release glucose.

Question 6

Which of the following best explains why phospholipids are essential components of cell membranes?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers that separate the cell from its environment.

Question 7

Which of the following is a correct structural difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 8

A food scientist is developing a new energy bar and wants to maximize the amount of stored energy per gram. Which macromolecule should they focus on including, and why?

Accepted Answer

Lipids, because they provide more energy per gram than carbohydrates or proteins.

Question 9

Which of the following best describes the structure of a triglyceride?

Accepted Answer

A glycerol molecule bonded to three fatty acids via ester linkages.

Question 10

Cellulose and starch are both polymers of glucose. What is the key difference in their structure that leads to their different properties?

Accepted Answer

Cellulose has $$\beta-1$$,4 glycosidic linkages, while starch has $$\alpha-1$$,4 glycosidic linkages.

Question 11

Which of the following is a function of chitin in nature?

Accepted Answer

It forms the exoskeleton of arthropods and provides structural support.

Question 12

A researcher labels a specific protein in a cell with a fluorescent dye. Which type of microscope would be best for visualizing the location of this protein?

Accepted Answer

Fluorescence microscope, because it detects the emission of light from the dye.

Question 13

Which of the following best explains why cholesterol is classified as a lipid?

Accepted Answer

It is hydrophobic and characterized by a carbon skeleton of four fused rings.

Question 14

If a plant cell is placed in a solution containing a dye that only stains hydrophobic regions, which part of the cell membrane would be most intensely stained?

Accepted Answer

The interior of the phospholipid bilayer, where the hydrophobic fatty acid tails are located.

Question 15

Which of the following is a correct statement about the function of polysaccharides in living organisms?

Accepted Answer

Glycogen serves as a storage form of glucose in animals, while starch serves this role in plants.

Question 16

A mutation causes a plant to produce a version of cellulose with $$\alpha-1$$,4 glycosidic linkages instead of $$\beta-1$$,4. What is the most likely consequence?

Accepted Answer

The plant would be unable to build strong cell walls, as the altered cellulose would resemble starch.

Question 17

Which of the following best describes the process of hydrolysis in biological systems?

Accepted Answer

It breaks down polymers into monomers by adding a molecule of water.

Question 18

Which of the following is a real-world application of understanding glycosidic linkages in carbohydrates?

Accepted Answer

The production of high-fructose corn syrup, which involves converting glucose to fructose using enzymes.

Question 19

Which of the following best explains why human sex hormones are considered lipids?

Accepted Answer

They are derived from cholesterol and are hydrophobic.

Question 20

Suppose a membrane surrounded an oil droplet in a plant seed. What form would this membrane most likely take, and why?

Accepted Answer

A phospholipid monolayer with hydrophilic heads facing the cytoplasm and hydrophobic tails facing the oil.

Cell Biology Fundamentals and Macromolecules – Study Notes for BIOL1010

Guida di studio - Domande di pratica

Study guide - Flashcard