1 Biology - Introduction to Biology

unicellular organisms

Organisms consisting of a single cell.

excretion

Removal of waste products by an organism.

waste

All living organisms produce ________ that needs to be removed.

Sperm

________ and egg cells fuse to form a child with combined genetic set.

eg plants

Can be obtained by eating other organisms or from the environment (________ photosynthesise)

Catabolism Organisms

________ break down complex molecules into simple molecules- releases energy.

Cells

The smallest structural and functional units of all organisms, and are usually only visible through microscopes.

Survival of organisms

________ requires food for energy and nutrients.

genetic information

Parents produce sperm and egg cells, each with half the ________ that the child will receive.

total of all biochemical reactions

The ________ occurring in a living organism is called metabolism.

Cells

________ differentiate and have different purposes early on (skin, muscle, blood, nerve ________ etc)

cell

The ________ is the smallest unit of life.

Anabolism; Organisms form complex molecules from simple molecules

consumes energy

Catabolism; Organisms break down complex molecules into simple molecules

releases energy

Sexual

two parents

Associated with mitosis

cell division

Anabolism

Organisms form complex molecules from simple molecules - consumes energy.

Catabolism

Organisms break down complex molecules into simple molecules - releases energy.

Asexual reproduction

Offspring is produced by a single parent which inherits all the parent's genes.

Sexual reproduction

Offspring is produced by the combination of sperm and egg cells from two parents

Homeostasis

Regulation of internal environment to a stable level.

Growth

An organism's development over time.

Excretion

Removal of waste products from an organism.

Unicellular organism

Composed of one cell which performs all functions required for life.

Multicellular organism

Composed of more than one cell which together perform all functions required for life.