Biology UNIT 1 Key Question Answers
UNIT 1:
Lesson 1
Key Questions:
1. Magnesium consists of 12 electrons; 2 + indicates a loss of 2 electrons; therefore, it now has 10 electrons.
2. The isotope would not be useful for dating bones that are over a million years old because carbon-14 decay at a constant rate, with a half-life of 5730 years. Therefore, after 40, 000 years, les than 1% of the carbon-14 is left in the tissue. As a result, there is not enough of the isotope in the tissues to determine the age of the bones.
3. The four types of biochemical reactions studied in this lesson are:
Hydrolysis: This biochemical reaction is important because it helps to break down molecules such as; food consumed. A person required water and enzymes to break down food. The reaction is: protein + water = amino acid + amino acid
Condensation: Occurs when two molecules combine to form one molecule. This biochemical reaction is known as dehydration synthesis because water is removed from the molecule. This condensation reaction occurs in the body when you are building muscle tissue. The reaction is:
Amino acid + amino acid = protein + water
Oxidation Reduction (redox): Oxidation is the process of losing electrons and reduction is the process of gaining electrons. Cellular respiration is an important example. The overall reaction combines glucose and oxygen to produce carbon dioxide, water and energy.
Neutralization reactions: Involves the reaction of an acid and base to produce water as a salt. This reaction only occurs within cells and in the human stomach’s intestines.
4a.
The substance being oxidized is C of C6H12O6. b. The substance that is reduced is O2
Lesson 2
Key Questions:
5.
Carbohydrates-
Monomer: monosaccharide
Functional group- aldehydes or ketones
Linages- glycosidic bond
Major Function: act as energy source, and structural purpose (cell wall e.g. cellulose)
Protein-
Monomer- amino acid
Functional group- amino and carboxyl
Linkage: peptide linkage
Major Function: building
Lesson 1
Key Questions:
1. Magnesium consists of 12 electrons; 2 + indicates a loss of 2 electrons; therefore, it now has 10 electrons.
2. The isotope would not be useful for dating bones that are over a million years old because carbon-14 decay at a constant rate, with a half-life of 5730 years. Therefore, after 40, 000 years, les than 1% of the carbon-14 is left in the tissue. As a result, there is not enough of the isotope in the tissues to determine the age of the bones.
3. The four types of biochemical reactions studied in this lesson are:
Hydrolysis: This biochemical reaction is important because it helps to break down molecules such as; food consumed. A person required water and enzymes to break down food. The reaction is: protein + water = amino acid + amino acid
Condensation: Occurs when two molecules combine to form one molecule. This biochemical reaction is known as dehydration synthesis because water is removed from the molecule. This condensation reaction occurs in the body when you are building muscle tissue. The reaction is:
Amino acid + amino acid = protein + water
Oxidation Reduction (redox): Oxidation is the process of losing electrons and reduction is the process of gaining electrons. Cellular respiration is an important example. The overall reaction combines glucose and oxygen to produce carbon dioxide, water and energy.
Neutralization reactions: Involves the reaction of an acid and base to produce water as a salt. This reaction only occurs within cells and in the human stomach’s intestines.
4a.
The substance being oxidized is C of C6H12O6. b. The substance that is reduced is O2
Lesson 2
Key Questions:
5.
Carbohydrates-
Monomer: monosaccharide
Functional group- aldehydes or ketones
Linages- glycosidic bond
Major Function: act as energy source, and structural purpose (cell wall e.g. cellulose)
Protein-
Monomer- amino acid
Functional group- amino and carboxyl
Linkage: peptide linkage
Major Function: building