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Ch.2 It's Alive! LT
ch. 2 It's Alive! Or is it?
| Question | Answer |
|---|---|
| the smallest unit that can perform all life processes; they are covered by a membrane and have DNA and cytoplasm | cell |
| anything that causes a reaction or change in an organism or any other part of an organism | stimulus |
| the maintenance of a constant internal state in a changing environment | homeostasis |
| reproduction in which the sex cells from 2 parents to unite producing off spring that share traits from both parents | sexual reproduction |
| reproduction that does not involve the union of sex cells and in which one parent produces offspring identical to itself | asexual reproduction |
| the passing of genetic traits from parent to offspring | heredity |
| the sum of all chemical processes that occur in an organism | metabolism |
| an organism that can make its own food by using energy from its surrounding | producer |
| an organism that eats other organisms or organic matter | consumer |
| decomposer | an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients |
| protein | a molecule that is made of amino acids and that is needed to regulate processes in the body |
| carbohydrate | a class of energy giving nutrients that include sugars, starches, and fiber contains carbon, hydrogen, and oxygen |
| lipid | a type of biochemical that does not dissolve in water: facts and steroids are lipids |
| phospholipids | a lipid that contains phosphorus and that is a structural component in cell membranes |
| ATP | adenosine triphosphate, a molecule that acts as the main energy source for cell processes |
| nucleic acid | a molecule made up of subunits called nucleotides |
| The sub units of nucleic acids are... | nucleotides |
| The four basic needs of every organisms are... | water, air, a place to live, and food |
| Cells of most living things are what percent water? | 70% |
| What is the chemical process in which most living things use oxygen? | releasing energy from food |
| How long can a human survive without water? | 3 days |
| How does limited amount of space on earth affect organisms? | Then they need to compete with eachother |
| what two things does food give organisms? | They give energy and raw materials needed for life |
| How do organisms use the nutrients from food? | They replace cells and build body parts. |
| A substance created when 2 or more atoms combine | molecules |
| Molecules made up of different kinds of atoms are... | compounds |
| Proteins that speed up chemical reactions | enzymes |
| a protein found in red blood cells that attaches to oxygen | hemoglobin |
| How do cells use carbohydrates? | They use them as a source of energy and for food storage |
Created by:
ltdancer97
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