Life Science Chapter 2

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Living Things

Stimulus

change in an organism's environment that affects the activity of an organism

carbohydrates

group of compounds made of sugars

homeostasis

maintenance of a stable internal environment

starch

complex carbohydrate made by plants

heredity

transmission of characteristics from one generation to the next

metabolism

chemical activities of an organism necessary for life

nucleicacids

made up of subunits called nucleotides

consumers

eats other organisms for food

decomposers

organism that breaks down the nutrients of dead organisms or wastes for food

phospholipids

two layers of these form much of the cell membrane

enzymes

proteins that speed up certain chemical reactions

DNA

molecule that provides instructions for making proteins

producer

organism that can produce its own food

cell

membrane-covered structure that contains all materials necessary for life

asexual

reproduction in which a single parent produces offspring that are identical to the parent

lipids

chemical compound that cannot mix with water and that is used to store energy

proteins

large molecule made up of amino acids

ATP

energy in food is transferred to this molecule

sexual

reproduction in which two parents are necessary to produce offspring that share characteristics of both parents

Can iodine be a tattleltale?

Yes, putting a drop or two of liquid iodine on a food item makes the starch (a complex carbohydrate) in that food turn a blue-black color.

All living things do this

have 1 or more cells
reproduce
grow and develop
have DNA
use energy
live organisms
live cells

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