Life science final exam

Newport news Va 7th grade science final

Cell theory

All living things are made of cells, All cells come from pre-existing cells, Cells are the basic unit of life

Unicellular

Organisms with one cell

Multicellullar

Orginisms with more than one cell

Nucleus

The control center of the cell, houses dna

Endoplasmic reticulum

Transports materials throughout the cell

Cytoplasm

Gel-like substance that surrounds the organnelles

Cell membrane

Controls what enters and exits the cell

Vacuoles

Stores water, food, and other materials

Mitochondria

Creates and stores energy, is the site for cellular respiration

Choroplast

Only in plants, site of photosynthesis

Cell wall

Only in plants, provides strength and support for plant cells

Phoytosynthesis

The process that plants do to make their own food

Diffusion

Movement of any molecules from an area of high concentration to low concentration

4 nitrogenous bases of DNA

Thymine, Guanine, Cytosine, Adenine

Interphase

Cell grows in size, DNA reproduces

Prophase

Nucleus breaks down chromatin, condenses into chromosomes

Metaphase

Chromsones line up in the middle of the cell

Anaphase

Chromasones separate and move to opposite ends

Telephase

Chromosomes unwind to become chromatin and nucleus reforms

Mutation

A change of DNA in a gene