Micro ch 7-1 quiz

Which of the following are examples of membrane transport that do NOT require energy from the cell?

-Diffusion Active transport -Osmosis -Facilitated diffusion Endocytosis

Nutrition

Process of acquiring the chemical substances needed for cellular activities

Nutrient molecules that contain the basic framework of carbon and hydrogen are called ______ nutrients.

organic

Nutrient

Chemical substances used in cellular metabolism and growth

The molecules in a solid lump of sugar do not move.

False

Micronutrients

Present in smaller amounts and are involved in enzyme function and maintenance of protein structure

Macronutrients

Required in relatively large quantities and play principal roles in cell structure and metabolism

A 5% urea solution is hypotonic to a 10% urea solution.

True

An organism's survival depends on its ability to move needed materials into the cell across the cell membrane and to transport wastes outside the cell across the cell membrane.

True

Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.

True

If a cell is placed in an isotonic medium, there will be no net movement of water.

True

A red blood cell placed in a hypertonic medium will

shrink

Which of the following will pass through a cell membrane most easily?

small nonpolar molecules

When sugar is mixed with water, equilibrium is reached when

the dissolved sugar molecules are evenly distributed throughout the solution.

Osmosis is best defined as the movement of

water molecules across a membrane from an area of high water concentration to an area of lower concentration.

The rate of diffusion is affected by which of the following?

A, B and C

Which of the following is NOT a characteristic of active transport?

Use of proteins to move molecules with the concentration gradient

Simple diffusion is defined as the movement of

molecules from areas of higher concentration to areas of lower concentration.