Aktyvioji, Pasyvioji Pernaša English

Question 1

What is passive transport?

Answer 1

Passive transport is the movement of substances across a cell membrane without the need for energy input.

Question 2

True or False: Active transport requires energy to move substances across a membrane.

Answer 2

True

Question 3

Fill in the blank: In passive transport, substances move from an area of ______ concentration to an area of ______ concentration.

Answer 3

high, low

Question 4

What is the main driving force behind passive transport?

Answer 4

The concentration gradient.

Question 5

Name one type of passive transport.

Answer 5

Diffusion.

Question 6

What is facilitated diffusion?

Answer 6

Facilitated diffusion is a type of passive transport that uses carrier proteins to help substances cross the membrane.

Question 7

True or False: Osmosis is a form of active transport.

Answer 7

False

Question 8

What role do transport proteins play in active transport?

Answer 8

Transport proteins help move substances against their concentration gradient using energy.

Question 9

Which molecule is primarily used for energy in active transport?

Answer 9

ATP (adenosine triphosphate).

Question 10

Multiple choice: Which of the following is an example of active transport? A) Diffusion B) Osmosis C) Sodium-potassium pump D) Facilitated diffusion

Answer 10

C) Sodium-potassium pump

Question 11

What is the difference between primary and secondary active transport?

Answer 11

Primary active transport uses ATP directly, while secondary active transport uses the energy from the gradient created by primary active transport.

Question 12

Fill in the blank: In secondary active transport, the movement of one substance ______ the movement of another substance.

Answer 12

drives

Question 13

True or False: Active transport can occur without the presence of a membrane.

Answer 13

False

Question 14

What is endocytosis?

Answer 14

Endocytosis is a process by which cells engulf substances to bring them into the cell.

Question 15

What is exocytosis?

Answer 15

Exocytosis is the process of expelling materials from a cell by vesicles fusing with the plasma membrane.

Question 16

Multiple choice: Which of the following is NOT a type of passive transport? A) Diffusion B) Osmosis C) Active transport D) Facilitated diffusion

Answer 16

C) Active transport

Question 17

What is the function of aquaporins?

Answer 17

Aquaporins are channel proteins that facilitate the transport of water across cell membranes.

Question 18

True or False: Active transport can move substances against their concentration gradient.

Answer 18

True

Question 19

Define concentration gradient.

Answer 19

A concentration gradient is the difference in the concentration of a substance between two areas.

Question 20

Fill in the blank: The _______ is the area where the concentration of a substance is higher.

Answer 20

source

Question 21

What is bulk transport?

Answer 21

Bulk transport refers to the movement of large quantities of materials into or out of a cell.

Question 22

Multiple choice: Which process allows cells to take in large particles? A) Pinocytosis B) Phagocytosis C) Diffusion D) Osmosis

Answer 22

B) Phagocytosis

Question 23

What is the role of sodium-potassium pumps?

Answer 23

Sodium-potassium pumps maintain the electrochemical gradient by transporting sodium out of the cell and potassium into the cell.

Question 24

True or False: Passive transport can occur through lipid bilayers.

Answer 24

True

Question 25

What type of molecules typically pass through the membrane via simple diffusion?

Answer 25

Small, nonpolar molecules.

Question 26

Fill in the blank: Active transport is essential for maintaining _______ within cells.

Answer 26

homeostasis

Question 27

What is the significance of the fluid mosaic model?

Answer 27

The fluid mosaic model describes the structure of cell membranes, highlighting their fluid nature and the presence of various proteins and lipids.

Question 28

Multiple choice: Which transport process is most likely to occur when a cell is in a hypertonic solution? A) Endocytosis B) Exocytosis C) Osmosis D) Active transport

Answer 28

C) Osmosis

Question 29

What happens to a cell in a hypotonic solution?

Answer 29

The cell swells as water enters the cell through osmosis.

Question 30

True or False: Active transport can only occur in living cells.

Answer 30

True

Question 31

What is the purpose of receptor-mediated endocytosis?

Answer 31

Receptor-mediated endocytosis allows cells to take up specific molecules based on their interaction with receptors on the cell surface.

Question 32

Fill in the blank: The _______ model illustrates the dynamic structure of the plasma membrane.

Answer 32

fluid mosaic

Question 33

What is the main difference between osmosis and diffusion?

Answer 33

Osmosis specifically refers to the movement of water, while diffusion refers to the movement of any substance.

Question 34

Multiple choice: What type of transport is used for glucose uptake in the intestines? A) Active transport B) Passive transport C) Both A and B D) None of the above

Answer 34

C) Both A and B

Question 35

What does it mean for a solution to be isotonic?

Answer 35

An isotonic solution has the same concentration of solutes as another solution, resulting in no net movement of water.

Question 36

True or False: Carrier proteins change shape to transport substances across the membrane.

Answer 36

True

Question 37

What is the function of the plasma membrane?

Answer 37

The plasma membrane regulates what enters and exits the cell, providing protection and support.

Question 38

Fill in the blank: In active transport, the cell often works against the _______ gradient.

Answer 38

concentration

Question 39

What is the role of cholesterol in the cell membrane?

Answer 39

Cholesterol helps to stabilize the fluidity of the membrane.

Question 40

Multiple choice: Which type of transport is most efficient for moving ions across membranes? A) Passive transport B) Active transport C) Both A and B D) None of the above

Answer 40

B) Active transport

Question 41

What is the significance of membrane potential?

Answer 41

Membrane potential is important for processes such as nerve impulse transmission and muscle contraction.

Question 42

True or False: The rate of passive transport can be affected by temperature.

Answer 42

True