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Chapter 2 Review
N/A
22
Biology
9th Grade
01/19/2010

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Cards

Term
What four elements make up 96% of the human body's mass?
Definition
Carbon, Hydrogen, Oxygen, and Nitrogen (CHON)
Term

Oxygen

Protons: 8

Electrons: 8

Neutrons: 8

What is oxygen's atomic number? mass?

 

Definition

Atomic number: 8

Atomic mass: 16

Term
What is the difference between ionic and colvalent bonds?
Definition

Ionic bond: ions gain or lose electrons

covalent bond: ions share electrons

Term
What bond holds together the atoms of a molecule?
Definition
covalent bonds
Term
When do atoms become stable?
Definition
when their outer electron level is full
Term
What is a hydrogen bond?
Definition
positive hydrogen attracted to a negative oxygen
Term
True or False: Water is a solute.
Definition
False; Water is a solvent which is the substance in which the solute is dissolved
Term
What is A and what is B?[image]
Definition

A=adhesion

B=cohesion

Term
 True or False: The concentration of H+ ions increases as the scale of the pH increases.
Definition
False; The concentration of the H+ decreases as the pH scale increases.
Term
Why is carbon important to the human body?
Definition
Because its atomic structure gives it unique bonding properties
Term
What are three fundamental structures of carbon molecules?
Definition
straight, branched, rings
Term
What is the ratio for carbohydrates?
Definition

C:H:O=

1:2:1

Term
Where is glycogen stored?
Definition
In muscles and liver
Term
[image]What is the only difference betweent he structures of amino acids?
Definition
The R group
Term
What are the two types of side group interactions that an amino acid can have?
Definition

1. Sulfur atoms-the sulfur atoms in an amino acid can form covalent bonds that force the protein bend into a certain shape

2. hydrogen bonds-cause the protein to fold into a specific shape

Term
What process binds amino acids together to create a polypeptide?
Definition
dehydration synthesis
Term
True or False: Enzymes are reusable.
Definition
True
Term
What has more stored energy: carbohydrates or lipids?
Definition
lipids
Term

1. Saturated fats are...(solid or liquid?)

2. Unsaturated fats are...(solid or liquid?)

Definition

1. Saturated fats are solids

2. Unsaturated fats are liquids

Term
True or False: A phospholipid consists of a phosphate head, glycerol, and three fatty acids.
Definition
False; A phospholipid consists of two fatty acids.
Term
What is the main difference between nucleic acids and carbohydrates, lipids, and proteins?
Definition
Nucleic acids have only one function: to make proteins.
Term

You have to really think about this question:

Is photosynthesis an endothermic or an exothermic reaction? cellular respiration?

Definition

Photosynthesis=endothermic

Cellular respiration=exothermic

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