top-rated free essay

Grade 12 Biology Exam

By traanjuulie Jun 08, 2014 861 Words
Biology 4U Exam Review

Intro to Biochemistry

Types of bonding:

Results from the attraction between two oppositely charged atoms or molecules. They must lose or gain electrons to become charged. For example, a sodium molecule and a chlorine molecule form an ionic bond to create sodium chloride (NaCl) Covalent

Results from the sharing of one or more pairs of valence electrons to create a stable molecule. For example, the covalent bonding of hydrogen ions creates hydrogen gas (H2) or the covalent bonding between carbon and hydrogen can create variations of a hydrocarbon like methane (CH4) Hydrogen

The attractive force between a partially positively charged hydrogen atom and a partially negative charged atom (like oxygen or nitrogen) in another molecule. For example, in water molecules, there are many hydrogen bonds that exist which is why water has it's unique qualities like high surface tension (refer to pg. 15 in txtbook if confused) Hydrophobic

Functional Groups:

Functional Group
Name of Compound
R – OH
R – C=O (end)
R – C=O (middle)
Carboxylic acids
R – C=O
\ OH

R – N – H
\ H

R – C=O
R – SH
Organic phosphates

(double bond between O and P)
R – O – P – O
(single carbon bonds)
R – C – C – H
(double carbon bonds)
R – C = C – H
(triple carbon bonds)
R – C = C - H
Ester linkage
(double bond between O and C)
R – C – O – R
Ether linkage

R – O – R

Biochemical Molecules (Macromolecules)
composed mostly of carbon, hydrogen, and oxygen (1:2:1)
organic molecule having two or more hydroxyl groups along with a carbonyl group sugars may be aldoses or keytoses (depending on the location of the carbonyl group) monomer: monosaccarides – simple sugars (glucose, fructose, galactose) 5 or 6 sided chain

disaccarides – two monosaccarides bonded by a glycosidic linkage (sucrose, maltose, lactose)
polysaccarides – a chain of monosaccharides with many subunites joined by glycosidic linkages (starches, cellulose, glycogen) three major functions: 1) important source of energy (quick, body's first source) 2) means by which chemical energy can be stored (short term) 3) serve as structural materials (chitin in insects)

non-polar and so therefore insoluble in water
five major functions: 1) major component of all cell membranes (phospholipids) 2) long term energy storage
3) insulation
4) cushioning for internal organs
5) making of steroid hormones
types of lipids: 1) triglycerides – glycerol and fatty acid chains 2) phospholipids – glycerol, fatty acids, phosphate group 3) waxes – long chains of many carbon atoms and monohydroxy alcohol 4) steroids (cholesterol) – three fused cyclohexane rings, and one cyclopentane ring
triglycerides are fat molecules composed of one glycerol and three fatty acid chains can be saturated (completely covered with single bonded hydrogen) eg., animal fats, lard or unsaturated (one or more double bonds of hydrogen to create “kinks”) eg., plant fats, oil Proteins

contain N, C, H, and O with similar basic structures
monomer: made up of long chains of amino acids (20 a.a.)
peptide chains: two or more a.a combined at carboxyl end to amino end via dehydration synthesis one end called c-terminus
other end called n-terminus

there are a variety of functions (ST. HER CD'S): 1) Structural 4) Enzymes 7) Defensive 2) Transport 5) Regulation 8) Storage 3) Hormones 6) Contractile There are four levels of protein folding: 1 (primary), 2 (secondary), 3 (tertiary), 4 (quaternary) refer to your notes on page 30 for more detail

denaturation: changes of 3D shape caused by disruption in pH environment, temperature, or ionic concentrator Nucleic Acids
Two types: 1) DNA – deoxyribonucleic acid
2) RNA – ribonucleic acid
* responsible for passing on and storing genetic information and protein synthesis located in the nucleus of a cell (DNA) and in the cytoplasm outside of nucleus (RNA) monomer: nucleotides: 1) phosphate group

2) 5 carbon sugar
3) nitrogenous base
Structures and Functions of Eukaryote Cells

three cell structures and/or organelles that have folded membranes: Golgi Apparatus
Rough Endoplasmic Reticulum
Smooth Endoplasmic Reticulum
the function of these membranes are used for greatly increasing the surface area to optimize the organelle's potential (eg., more space for receptors, and absorption to occur) Peroxisomes
They are small vesicles found around the cell. They have a single membrane that contains digestive enzymes for breaking down toxic materials in the cell. major function is the breakdown of very long chain fatty acids through beta-oxidation Endoplasmic Reticulums

Rough – have thousands of ribosomes attached to the outer surface of the ER. The ribosomes create polypeptide chains that are released into the ER to fold and take on their own structure (i.e., tertiary, quaternary) Smooth – has no ribosomes, so it does not make proteins. Some of the polypeptides that are made in the rough ER end up in the smooth ER as enzymes that assemble lipids or inactivates toxins Nucleus

contains, and protects almost all DNA in a eukaryotic cell
Also contains other organelles within it:
Nuclear envelope – two lipid bilayer membranes that encloses the nucleus contains different types of membrane proteins like receptors and transporters. Selectively permeable and porous. Connected to the ER Nucleolus – enclosed by the nuclear envelope. Contains nucleoplasm (similar to cytoplasm) Dense, irregularly shaped region where subunits of ribosomes are assembled from proteins and RNA. Chromatin – total collection of all DNA molecules and associated proteins in the nucleus Nuclear pores and nucleoplasm


Cite This Document

Related Documents

  • grade 12 AP biology exam notes

    ...Biochemistry Essential Elements of Life Carbon, hydrogen, oxygen, nitrogen (96%) Calcium, phosphorus, potassium, sulphur (4%) Isotopes Atoms of an element that differ in neutrons Radioactive isotopes decay spontaneously, giving off energy Cohesion Hydrogen bonds hold water molecules together Adhesion is an attraction between t...

    Read More
  • Biology 12

    ... Discussion: 1. Peter was preparing some potatoes for cooking. He put some water in a pot and added some salt. He cut up the potatoes and put them in the salt solution. Then the telephone rang and he spent 30 minutes talking to George. When he returned to put the potatoes on the stove they were flaccid (soft). Explain what happened to the po...

    Read More
  • Unit One Grade 12 Biology Study Notes

    ...Macro molecules Lipids (Fats, phospholipids, sterols) Fats used to insulate the body as well as protect organs SATURATED -better for you -one or more double bonds between carbons -less hydrogens -oils (sunflower, flax) -lower melting point UNSATURATED -worse for you -single bonds between carbons -more hydrogen...

    Read More
  • Biology Grade 12, cell identification and communication b) Proteins i) Monomer(s) Amino acids ii) Functional groups An amino group (NH2), carboxylic acids (COOH) and a radical group (R) iii) Linkage type Peptide bond iv) Primary function Almost everything cells do c) Lipids i) monomer(s) Triglycerides ii) Functional groups...

    Read More
  • Grade 12 Chemistry Exam Prep

    ...Organic Chemistry Basic Ideas: Carbon chains: Straight chains and branched chains, Numbering of chains and branches. Carbon Rings: Cyclic Molecules, Aromatic Compounds Types of Organic reactions: Combustion Addition Substitution Condensation Oxidation What is organic chemistry? Carbon compounds. Methane CH4 Hexane C6 H14 ...

    Read More
  • Grade 11 Biology Exam Review

    ...Diversity WORD | DEFINITION | Mitochondria | The part of a cell where cellular respiration occurs | Vacuole | The part of a cell used for storage | Cytoplasm | Fluid found outside the nuclear membrane | Morphology | The branch of bio that deals with the structure or form of organisms | Taxon | A named group of organisms | Phyloge...

    Read More
  • Grade 12 Biology Notes

    ...Biology notes for FST Project *ADD SUMMARIES AT END OF CHAPTERS UNIT 1 Macromolecules * Large molecules sometimes composed of a large number of repeating subunits * Four major classes: Carbohydrates (made of simple sugar/glucose), Lipids (Glycerol and Fatty Acids), Proteins (Amino Acids) and Nucleic Acids (Nucleotides) * Con...

    Read More
  • Biology

    ...Experiments investigating the effect of a particular factor on an enzyme-catalysed reaction are commonly used as assessed practicals in Biology. The reason for this is there are a number of factors that can be investigated, and therefore, a number of factors that can also be controlled. From our lecture, we are aware that the following can a...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.