unit 2 biology study guide

Organelles in prokaryotic cells include the

• a. Mitochondria

• b. Endoplasmic reticulum

• c. Golgi apparatus

• d. None of the above

All cells have the following:

• a. Cell membrane; cytoplasm; and ribosomes

• b. Cell membrane; nucleus; and DNA

• c. DNA; ribosomes; and cell wall

• d. Cell membrane; cytoplasm; and nucleus

Which of the following best describes how the model below explains cell (plasma) membranes are

selectively permeable?

• a. All molecules move through the plasma membrane.

• b. Only lipid soluble molecules move through the plasma membrane.

• c. Only specific non-lipid soluble molecules or ions move through the cellular membrane.

• d. Specific molecules will pass through the plasma membrane, while other molecules cannot pass

  through.

1. Red blood cells were placed in three types of solutions. Which of the cells were placed in an isotonic solution? 

• 2. Cell B since water is moving out of the cell at a faster rate.

• 1. Cell B since water is moving in and out of the cell at the same rate.

• 1. Cell B since water is moving out of the cell at a faster rate.

• 1. Cell C since water is moving out of the cell at a faster rate

1. n an investigation on tonicity, a group of students drop salt water on this cell below. What will the students most likely observe? 

3. The plant will [shrink/swell/stay the same]. This is because the salt water is a [hypotonic/hypertonic/isotonic] solution which causes the water to [enter/exit/stay in] the plant cell.

• shrink

  hypertonic

  exit

• swell

  hypotonic

  enter

• stay the same

  istonic

  stay in

• shrink

  hypotonic

  enter

1. Select all that apply: Why might a cell use endocytosis or exocytosis to transport molecules across the cell membrane? 

• 1. Molecules are too small to be transported by passive transport at one time. 

• 1. Molecules are too large to be transported by passive transport at one time.

• 1. There are too many molecules to be transported by passive transport at one time.

• 1. There are too few molecules to be transported by passive transport at one time.

When the concentration of molecules on both sides of a selectively permeable membrane is the same

this is called equilibrium. At equilibrium, __.

• a. More Molecules move across the membrane to the outside of the cell.

• b. Molecules stop moving across the membrane.

• c. Molecules move across the membrane at the same rate in both directions.

• d. More Molecules move across the membrane to the inside of the cell.

Which type of cellular transport would be most affected by damage to mitochondria?

• 1. Active transport

• 1. Osmosis

• 1. Diffusion

• 1. Facilitated diffusion

1. There are two types of cellular transport. In active transport, the molecules are moving [with/against] the concentration gradient and this movement [does/does not] require ATP energy. This is because the molecules are moving from an area of [low/high] concentration to an area of [low/high] concentration of molecules. 

• against

  does

  low

  high

• with

  does not

  high

  low

• against

  does not

  high

  low

• with

  does

  low

  high

Why is an animal cell that is surrounded by fresh water likely to burst (lyse)?

• 1. Water moves into the cell via osmosis.

• Water moves out of the cell via osmosis.

• 1. Solutes move into the cell via osmosis.

• 1. Solutes move out of the cell via osmosis.