Science - Ch. 1 Lessons 1-4: 7th Grade

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Cell theory

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23 Terms

1

Cell theory

A widely accepted explanation of the relationship between cells and living things

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2

Cell wall

A rigid structure that surrounds the cell membrane and provides support to the cell

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3

Nucleus

acts as a cell's control center, directing all of the cell's activities.

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4

Multicellular

Made up of more than one cell.

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5

Compound

form when two or more elements combine chemically.

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6

Element

A substance that cannot be broken down into simpler substances

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7

Lysosome

contains substances that break down large food particles into smaller ones

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8

Osmosis

the diffusion of water molecules across a selectively permeable membrane

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9

Tissue

A group of similar cells that perform a specific function.

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10

Organ system

A group of organs that work together to perform a major function.

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11

Chloroplast

Captures energy from sunlight and changes it to a form of energy cells can use in making food.

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12

Organelle

carries out specific functions within a cell

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13

Passive transport

The movement of dissolved materials across a cell membrane without using the cell's energy.

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14

Golgi Apparatus

receives proteins and other newly formed materials from the ER, packages them, and distributes them to other parts of the cell or to the outside of the cell

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15

Diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration.

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16

Ribosome

small grain-shaped organelles that produce proteins

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17

What is the organization of your body?

cell, tissue, organ, organ system, organism

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18

Endocytosis

the cell membrane changes shape and engulfs the particle

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19

Exocytosis

reverse of endocytosis which allows large particles to leave a cell.

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20

What is DNA?

is the genetic material that carries information about an organism and is passed from parent to offspring. This information directs a cell's functions.

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21

Shape of DNA

The shape of a DNA molecule is described as a double helix or a twisted ladder.

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22

Examples of Compounds

carbon dioxide, H2o

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23

Name 2 things water is useful for

It helps keep cells their shape. It also helps keep the temperature of cells from changing rapidly

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