7Th Grade Science Chapter 2 Characteristics Of Living Things

Front 1

Cell

Back 1

is a structural and functional unit of life. It is the smallest unit tat can carryout the activity of life. All living things are composed of one or more cells. Cells are surrounded by a cell membrane and most are too small to be seen with the naked eye.

Front 2

Homeostasis

Back 2

The maintenance of a stable internal environment in a changing external environment. An example is body temperature.

Front 3

Sexual reproduction

Back 3

reproduction in which sex cells from two parents unite to produce offspring that share traits from both parents. Mammals, such as dogs, elephants, and human beings reproduce this way.

Front 4

Asexual reproduction

Back 4

reproduction that does not involve the union of sex cells and in which one parent produces offspring that are genetically identical to the parent. Most single celled organisms reproduce this way, such as the amoeba.

Front 5

Metabolism

Back 5

the sum of all chemical processes that occur in an organism. This is the activity rate for changing food into energy, breaking down food, moving materials in and out of cells, growing, and building cells.

Front 6

Producer

Back 6

an organism that can make its own food by using energy from its surroundings. An example is a plant that uses photosynthesis.

Front 7

Consumer

Back 7

an organism that eats other organisms or organic matter. An example is a bear, which eats both berries (producer) and fish (consumers).

Front 8

Decomposer

Back 8

an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients. An example is mushrooms, which breaks down plants matter on the forest floor.

Front 9

Protein

Back 9

a molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes in the body. (people eats this when they eat meats, beans, and nuts)

Front 10

Carbohydrate

Back 10

a class of molecules that include sugars, starches, and fiber. (people eat this when they eat fruits and vegetables)

Front 11

Lipids

Back 11

a fat molecule or a molecule that has similar properties. These cannot mix with water. Some store energy and some form the membranes of cells.

Front 12

Phospholipids

Back 12

a lipid that contains phosphorus and that is a structural component in a cell membrane.

Front 13

ATP

Back 13

(adenosine triphosphate) a molecule that acts as the main energy source for the cell processes. Energy in carbohydrates and lipids is transferred to ATP to provide fuel for the cell.

Front 14

Nucleic acid

Back 14

molecules made up of subunits called nucleotides. They carry the directions for how to make proteins. DNA and RNA are nucleic acids.

Front 15

Heredity

Back 15

the passing of traits from one generation to the next

Front 16

Stimulus

Back 16

a change that affects the activity of the organism

Front 17

Cell Fact

Back 17

All living things are composed of one or more cells

Front 18

cell membrane

Back 18

outer covering of a cell, covers the structure that contains all of the materials necessary for life

Front 19

Living thing fact

Back 19

living things sense and respond to change

Front 20

Living thing fact 2

Back 20

Living things reproduce

Front 21

Living things fact 3

Back 21

living things have DNA

Front 22

DNA

(Deoxyribonucleic acid)

Back 22

controls the structure and the function of cells

Front 23

Living things fact 4

Back 23

living things grow and develop

-seed to a tree

-infant to adult

Front 24

Living things fact 5

Back 24

living things use energy