Tschida Semester 1 Biology 1 Final Study Guide

Front

What are enzymes?

Back

Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed in the process.

Front

What can destroy enzymes?

Back

Enzymes can be destroyed by variations in temperature and pH.

Front

What is a hydrogen bond?

Back

A hydrogen bond is a weak attraction between a hydrogen atom and an electronegative atom, often represented by a dotted line in molecular diagrams.

Front

What is osmosis?

Back

Osmosis is the movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What happens to an egg in distilled water?

Back

The egg absorbs water through osmosis, causing it to swell and become tight.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that is present at the start of a chemical reaction and is transformed into products.

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What is exocytosis?

Back

Exocytosis is the process by which a cell expends energy to release waste or other materials outside of the cell.

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What is diffusion?

Back

Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a membrane.

Front

What is the role of enzymes in chemical reactions?

Back

Enzymes lower the activation energy required for a chemical reaction to occur, thus speeding up the reaction.