Question 1

Which of the following best describes the role of lectins in cellular communication?

Accepted Answer

Lectins bind specifically to certain carbohydrates, allowing cells to recognize and respond to sugar codes.

Question 2

Which property of lectins is most critical for their biological function?

Accepted Answer

Their amphipathic molecular structure.

Question 3

Which type of interaction is primarily used by lectins to recognize specific glycans?

Accepted Answer

Hydrogen bonds

Question 4

Integrins are best described as:

Accepted Answer

Plasma-membrane proteins that mediate signals between a cell and the extracellular matrix.

Question 5

Which of the following statements about integrins is FALSE?

Accepted Answer

Integrins have transmembrane portions that protrude out of their functional parts into extracellular space.

Question 6

Which of the following best describes the 'Sugar Code' analogy as presented in the study material?

Accepted Answer

Monosaccharides are 'letters', oligosaccharides are 'words', and complex glycans are 'sentences'.

Question 7

Which of the following is NOT a function of lectins?

Accepted Answer

Catalyzing the hydrolysis of glycosidic bonds in carbohydrates.

Question 8

A mutation in a lectin gene results in loss of carbohydrate binding. Which cellular process is most likely to be affected?

Accepted Answer

Cell-cell recognition and signaling.

Question 9

Which of the following best explains why lectins do not hydrolyze the carbohydrates they bind?

Accepted Answer

Lectins lack catalytic activity for glycosidic bond cleavage.

Question 10

Which of the following is a real-world example of lectin function?

Accepted Answer

Selectins mediating white blood cell adhesion to blood vessel walls during inflammation.

Question 11

Which of the following best describes the specificity of lectin-carbohydrate interactions?

Accepted Answer

Lectins bind only to specific carbohydrate structures, similar to how enzymes recognize substrates.

Question 12

Which of the following is a correct statement about the extracellular matrix (ECM)?

Accepted Answer

The ECM provides structural and biochemical support to surrounding cells.

Question 13

Which of the following bonds is NOT primarily involved in lectin-glycan recognition?

Accepted Answer

Disulfide bonds

Question 14

Which of the following best describes the function of selectins?

Accepted Answer

Selectins are lectins that mediate cell-cell adhesion by binding to specific carbohydrates on neighboring cells.

Question 15

A patient has a genetic defect in integrin function. Which of the following processes is most likely to be impaired?

Accepted Answer

Cell adhesion to the extracellular matrix.

Question 16

Which of the following statements about the 'Sugar Code' is correct?

Accepted Answer

Cells use specific carbohydrate sequences to encode biological information.

Question 17

Which of the following is a plausible consequence of a mutation that disrupts lectin-carbohydrate binding?

Accepted Answer

Impaired immune cell recognition and response.

Question 18

Which of the following best explains why selectins are important in the immune response?

Accepted Answer

They mediate the adhesion of white blood cells to blood vessel walls, facilitating their migration to sites of inflammation.

Question 19

Which of the following is a key difference between integrins and lectins?

Accepted Answer

Integrins primarily mediate cell-ECM adhesion, while lectins recognize specific carbohydrate structures.

Lectins, Sugar Code, and Cell Adhesion: Biochemistry Study Notes

Guida di studio - Domande di pratica