Cellular Transport

Which of the following does active transport require?

• cells

• energy

• lipids

• Phospholipids

What is the name of the process by which water moves into or out of cells from areas of greater concentration to areas of lesser concentration?

• diffusion

• Endocytosis

• Osmosis

• Endocytosis

Which of the following describes the process by which large molecules (and food for some unicellular organisms) are brought into a cell?

• Cytolysis

• Endocytosis

• Exocytosis

• purple

The process by which large molecules that will not diffuse through the phospholipid bilayer of a cell membrane, actually move through channels in the membrane’s proteins from a high concentration to a low concentration is called ___________.

• facilitated diffusion

• osmosis

• adhesion

• capillarity

What is the source of energy used to power active transports?

• protein

• blue clouds

• ATP

• Sunlight

Tags

NGSS.HS-LS1-7

Which term suggests that a molecule in the cell membrane is “water loving”?

• Hydrophilic

• Hydrophobic

• Hypertonic

• Hypotonic

Cells are the basic unit of ____________ and _____________ for all living things. (pick two)

• structure and function

• structure and energy

• function and energy

• function and sun

Tags

NGSS.MS-LS1-2

A balloon filled with helium is less dense than the air in which the balloon floats.  However by the next day, helium balloons are often deflated and they no longer float.  Which of the following best describes why the balloon has deflated?

• Helium molecules are able to diffuse through the balloon and since the concentration of helium is higher in the balloon than in the air, they diffused out of the balloon.

• Helium molecules are able to diffuse through the balloon and since the concentration of helium is higher in the air than in the balloon, they diffused out of the balloon.

• Helium molecules are unable to diffuse through the balloon. Oxygen and carbon dioxide molecules diffused into the balloon, making it heavier so it no longer floats on air.

• Helium molecules are unable to diffuse through the balloon. The helium molecules are broken down by oxygen diffusing into the balloon causing the balloon to become heavier and sinking.

In class we put a piece of potato into a beaker of freshwater and another piece in a beaker of saltwater. The piece of potato in the freshwater became very stiff.  Which of the following occurred to make the piece of potato stiff?

• Since there is a higher concentration of salt in the potato than outside of the potato, the salt moves out of the potato by the process of diffusion making the potato become stiff.

• Since there is a higher concentration of salt in the potato than outside of the potato, the salt in the water moves into the potato by the process of diffusion making the potato become stiff.

• Since there is a higher concentration of water outside of the potato than inside in the potato, the water moves into the potato by the process of osmosis making the potato become stiff.

• Since there is a higher concentration of water outside of the potato than inside in the potato, the water moves out of the potato by the process of osmosis making the potato become stiff.

Tags

NGSS.MS-LS1-3

Which of the following describes a cell that is isotonic with its environment?

• The cell and the environment have an equal concentration of solute molecules.

• The cell has a lower concentration of solute molecules than the environment

• The cell has a lower concentration of solvent molecules

• The cell has a higher concentration of solute molecules