biochemistry review. unit target: use models to explain how the structures of organisms help them to...
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Unit Target: Use models to explain how the structures of organisms
help them to perform life’s functions.
Learning Target: Identify the subatomic particles in an atom. (K)
Which letter is pointing to the nucleus of the atom?
E
What is the charge associated with letter D?
negative
When an atom gains or loses an electron it is called
a. An ion
b. A polar molecule
c. A compound
d. A valence electron
a. (examples: Na+ Cl- K+ OH-)
Learning Target: Explain how subatomic particles interact to form
a variety of chemical bonds. (R)
What part of the atom is most involved in bonding?
a. Proton
b. Neutron
c. Electron
d. Energy level
c.
Is the statement true or false? If it is false, modify the underlined
word to make it true.
Atoms bond to fill their inner orbit.
False. Atoms bond to fill their outer orbit.
Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?
a. Compound
b. Molecule
c. Chemical bond
d. Valence electron
a. compound
Why is bonding important to living things?
a.Bonding forms the compounds found in living things.
b.Bonding causes the breakdown of large molecules into smaller molecules.
c.Bonding forms atoms
d.Bonding causes nuclei to join
a.
Which atom is able to bond with itself and other atoms allowing it to form a tremendous variety of bonds?
a.Oxygen
b.Carbon
c.Nitrogen
d.Sodium
b. Carbon- because it has 4 valence electrons
Match the type of bond with its description
Covalent a. The weak attraction Polar covalent between waterHydrogen moleculesIonic b. A bond formed
by atoms gaining or losing electrons
c. A bond formed when electrons are
sharedd. An unequal sharing of electrons
Chemical equations can be used to show how chemicals bond or breakdown. In the equation below identify the reactants and products.
K + Cl KCl
reactants product
Learning Target: Describe the structure of water. (K)
What is the chemical formula for water?
H2O
Do electrons spend more time around the oxygen or hydrogen atom?
O
Because electrons spend more time around the oxygen atom of a water molecule its charge is
a. Slightly negative
b. Very negative
c. Slightly positive
d. Very positive
a. Slightly negative
Learning Target: Relate the structure of water to the functions it
performs in living things.(R)
What is the most abundant compound found in living things?
water
Which color atom(s) represents oxygen?
Black circle
Which color atom(s) represent hydrogen?
Red circle
What charge would you put on the H atoms?
+
Match each chemical characteristic of water with its description.
Cohesion a. Allows insects to walk
on water
Adhesion
b. Forms drops of water
Capillary Action
c. Keeps bodies of water
Surface Tension from changing quickly
Temperature d. Moves water up plants
moderation
e. forms dew on a leaf
Learning Target: Describe the role of organic molecules in the structure and
function of living things. (K)True or False?
Organic molecules all contain carbon and hydrogen atoms.
True
Carbon can bond with many other atoms because it has 4 protons.
False- Valence electrons
Name the 4 organic compounds necessary for living things.
Carbohydrates
Proteins
Lipids
Nucleic Acids
Learning Target: Relate the structure of carbon the functions it performs in living
things. (R)
Carbohydrate a. Contains genetic info
Lipid b. Store energy
Protein c. Building blocks of
Nucleic Acid many structures of the body
d. Source of quick
energy for cells
Match each type of organic molecule with an example
Carbohydrate a. Fats, oils and waxes
Protein b. Sugars and starches
Lipid c. DNA and RNA
Nucleic Acid d. Muscle, skin
Match the organic molecule with its building block (monomer)
Carbohydrates monosaccharides
Proteins fatty acids and glycerol
Lipids nucleotides
Nucleic acids amino acids
Learning Target: Interpret a graph to determine how the structure of food is
related to its energy content. (S)
Food Carbs Protiens Lipids Calories
Chicken noodle soup
17g 5g .5g 90
Apple 17g 0g 0g 65
Which food would supply you with the most energy per serving?Chicken noodle soup
How do you know?It contains more calories therefore more energy
Which food had the greatest change in temperature?
Peanut- more energy (heat) was released, high fat content
What is the dependant variable?
Temperature
Learning Target: Describe the structure of enzymes (K)
What type of organic molecule is an enzyme?
Protein
Are enzymes all the same shape?
No- they each have their own unique shape
Can an enzyme catalyze many different reaction or just one?
Just one
Learning Target: Relate the structure of enzymes to the functions they perform in
living things. (R)
What is the function of an enzyme?
a. To generate heat
b. To speed up chemical reactions
c. To slow down chemical reactions
d. To cool off chemical reactions
b- they are called biological catalysts
H2O2 H2O + O2 catalase
Name the reactant. H2O2
Name the products. H2O and O2
What type of activation energy started this reaction?chemical
What was the catalyst?
catalase
True or False? When an enzyme is denatured the shape is altered so it no longer matches the shape of the products.
False substrate
1 is the _________ site.active
2 is the ________ _________ complexEnzyme-substrate
A and B are the _______________products
Based on your knowledge of enzymes and indicators explain what happened.
What catalyst is contained in test tube C?
amylase (enzyme)What did amylase do to
the starch?broke it down into sugar
How can you be sure starch was broken down into sugar?the indicator (Benedict’s) changed from blue to orange in the presence of sugar.