Science 7-Chapter 3 Life Science-Words to Know

Created by bcarr176 

Upgrade to
remove ads

DNA

The genetic material in the cell. Composed of C, H, O, N, P, and some S. It is shaped like a ladder with crosspieces on the ends and rods connecting them.

RNA

This is what carries the information from the chromosome to the ribosomes where proteins are made. It is a single strand.

mitosis

Mitosis is the processes of taking old cells and making them into two new daughter cells that are exactly like the original. The purposes of mitosis are to remake old cells, the organism can add new cells to get bigger and if a cell is injured or damaged.

enzyme

These are protiens that speed up or slow down the chemical processes in cells. It controlls the speed and activity the cell is doing.

element

Any substance that can be broken into smaller substances.

compound

When two or more elements combine chemicly, forms a compound.

molecule

Smallest particle of a compund.

organic

An element that contains Carbon and is very complex.

inorganic

Every element that does not contain Carbon.

protein

Also known as amino acids. They are a part of the cell membrain and make up many of the organells in the cell membrain.

lipid

Cells that store energy to be used later.

carbohydrate

Energy compounds composed of Carbon, Hydrogen, Oxygen, and Nitrogen

glucose

Product of Photosynthesis and component of Respiration.
C6H12O6

amino acid

Make up the protien.

nucleic acid

Complex molecules composed of Carbon, Hydrogen, Oxygen, Nitrogen, and Phospourus. Carry all the information necessary for an organism to carry out reproduction.

active transport

Any movment of particles going inside or outside the cell that requires energy.

passive transport

Any moement of particles inside or outside the cell that does not require energy.

centriole

The organelles in an animal cell to which the spindle fibers attach just before mitosis occurs. Plant cells do not have centrioles, because the spindle fibers attach directly to the cell wall.

centromere

The middle structure of a double chromosome that attaches the two halves of the chromosome together.

chromosome

The structure that contains all the info of DNA in it.

chromatid

One half of the double stranded chromosome.

eukaryotic

Cells that have a membrane around the nucleus and other membrane-bound organelles. All organisms, other than bacteria, are eukaryotic

prokaryotic

Cells that have no membrane around the nucleus or any other cellular organelles.

food chain (web)

The circle of life where one type of organism depends upon another for nutrients or raw
materials.

regeneration

The process for an organism to re-grow a part/portain of it's body.

fission

One-celled organisms, like bacteria, simply split in half and make two cells out of one. Each daughter cell is exactly like the parent cell, genetically.

autotroph

An organism that can produces it's own food using the sun's energy directly.

heterotroph

An organism that cannot produces it's own food. It uses the energy from the autotrophs it eats to reun cell processes.

photosynthesis

A process that only autotrophs and plants do. 6 Carbon molecules, 6 Hydrogen molecules and water (H2O) enter the organim and prodouces 1 glucose molecule (C6H12O6) and 6 Oxygen molecues.

respiration

A process that all organisms do. It's the exact oppostire if Photosynthesis. 1 glucose molecule (C6H12O6) and 6 Oxygen molecues enter the organism and produces 6 Carbon molecules, 6 Hydrogen molecules and water (H2O).

fermentation

A process that releases energy from sugar without oxygen present.

latic acid

One of the by-products of fermentation in the human body. When the human body is
exercising and cannot breathe in oxygen fast enough, the body carries out fermentation to produce energy. This releases less energy and produces lactic acid which causes muscles to become sore.

ethyl alcohol (ethanol)

another by-product of fermentation in yeast and some other simple organisms. When they carry out fermentation, the alcohol and carbon dioxide are produced. Beer and wine makers, and bakers use yeast to make their product,

selectively permeable

Selectively permiable means that smaller particles can go throug, but bigger particles cannot. An example of this would be all cell membrains.

cell membrain

The cell membrain is a barrier composed of protiens and lipids. It is selectvely permiable and only lets in particles that can hlep the cell.

organelle

Any part of the cell that perfromes a function.

mitochondria

the organelle that breaks down glucose to release the energy needed for the
cell to survive

chloroplast

the organelle that contains the chlorophyll needed to carry out photosynthesis.

chlorophyll

The substance inside the chloroplast that is needed to carry out photosynthesis.

nucleus

The brain of the cell. Contains the DNA needed to carry out the functions of the cell.

nucleolus

The organelle within the nucleus that specifically governs the cells ability and timing for reproduction.

ribosome

The organelle that makes all the proteins cells need from DNA and RNA

osmosis

The process of diffusion of water. It moves from a higher concentration to a lower concentration.

diffusion

The process of moving from ahigher concentration to a lower concentrtion.

Endoplasmic Reticulum (ER)

The organelle that moves proteins and enzymes around in the cell. The inter-cellular highway.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set