BSC1010L MIDTERM PRACTICAL PBSC ACTUAL

BSC1010L MIDTERM PRACTICAL (PBSC) (ACTUAL / )

QUESTIONS AND VERIFIED CORRECT ANSWERS

Eukaryotic cells - -----Answers---are cells that contain a nucleus and organelles, and are enclosed by a plasma membrane; Ex.protozoa, fungi, plants and animals

Autotrophs - -----Answers---are organisms that can produce their own food from the substances available in their surroundings using light

Heterotrophs - -----Answers---cannot synthesize their own food and rely on other organisms

Plant cells - -----Answers---contain chloroplasts, a cell wall, and vacuoles

Field of view decreases - -----Answers---If magnifications increases

Depth of field increases - -----Answers---If magnification decreases

Diffusion - -----Answers---is a spontaneous movement of particles from an area of high concentration to an area of low concentration

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Osmosis - -----Answers---Diffusion of water through a selectively permeable membrane

Brownian movement - -----Answers---The random movement of microscopic particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium

Carmine dye - -----Answers---a vivid red lake consisting essentially of an aluminum salt of carminic acid made from cochineal

Dialysis tubing - -----Answers---Tubing made from a synthetic, semi-permeable membrane

Chemical potential - -----Answers---Energy stored in the bonds between atoms

Water potential - -----Answers---the physical property that predicts the direction in which water will flow

Semipermeable membrane - -----Answers---allows the passage of some particles while blocking the passage of others

Selectively permeable - -----Answers---also called semipermeable membrane 2 / 3

Isotonic - -----Answers---when the concentration of two solutions is the same

Hypotonic - -----Answers---Having a lower concentration of solute than another solution

Hypertonic - -----Answers---Having a higher concentration of solute than another solution.

Osmotic pressure - -----Answers---the external pressure that must be applied to stop osmosis

Turgor pressure/turgid - -----Answers---The pressure inside of a cell as a cell pushes itself against the cell wall.

Plasmolysis - -----Answers---A phenomenon in walled cells in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall; occurs when the cell loses water to a hypertonic environment.

Solute - -----Answers---A substance that is dissolved in a solution.

Solution - -----Answers---A homogeneous mixture of two or more substances

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