1. Unit 2 Biomolecules
2.1 Intro to Biomolecules

2. Written Response 1 True or False: Answer in your notebook.
Chemicals are made up of cells.
False
Organic means something is chemical-free.
We need water because each cell is filled with water.
True
Fats are bad for you.
It is important for your body to stay exactly the same.
Proteins are a good source of energy.
Carbohydrates help “build” your body structures.
An enzyme can be used again and again to speed up a chemical reaction.
A buffer keeps the pH at neutral.
False – Prevents pH to change.

3. Molecules For example: CO2 = 1 carbon + 2 oxygen
Matter is anything that takes up space and has mass
All matter is made up of one or more ELEMENTS. Elements are found in nature as solids, liquids, or gases. Scientists have organized natural Elements into a periodic table.
Elements can take on different properties when they are bonded together with other elements to form a MOLECULE.
For example:
CO2 = 1 carbon + 2 oxygen
NaCl (table salt) = 1 Sodium + 1 Chlorine
H2O2= 2 Hydrogen + 2 Oxygen (hydrogen peroxide fizzes when cleaning cuts)

4. Where can I find chemical in my body?
A chemical is a substance that is made up of elements/molecules and used in a chemical reaction.
Chemicals made up of more than one type of element are called compounds.

5. Living things are made of two main types of chemical compounds:
Inorganic: compounds that do not contain carbon.
Examples: Water, Salt, O2 ( water most important inorganic cpd for life)
Water is the most abundant compound in a cell. (Most organisms are 60-90% water by weight.
Most chemical reactions occur in water because it provides an optimum environment.
Ex. Transport of molecule in the cell.

6. Living things are made of two main types of chemical compounds:
2. Organic: compounds that DO contain carbon, oxygen, and hydrogen. There are four main types:
Carbohydrates (CHO)
Lipids (CHO)
Proteins (CHON)
Nucleic Acids (CHONP)

7. Organic vs. Inorganic C -- H Organic Inorganic NO C -- H
carbon-hydrogen bond
C -- H
carbon – hydrogen bond
C -- H

8. Organic Inorganic OR

9. O or I?!
ORGANIC

10. ORGANIC

11. INORGANIC

12. ORGANIC

13. INORGANIC

14. ORGANIC

15. INORGANIC

16. How do the six essential elements help to maintain homeostasis?
Written Response #2:
Answer the following question to the best of your ability based on prior knowledge and we have covered up to this point. Take in consideration of each of the elements.
(CHNOPS) – Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, and Sulfur.

17. How do the six essential elements help to maintain homeostasis?
The elements make up essential organic and inorganic compounds. Each type of molecule performs specific function/job in organisms.
Hydrogen is also donated or accepted by weak acid-base pairs to regulate the pH of a system like cells and blood. These weak acid-base pairs are called buffers.

18. Buffers
When a cell’s pH drops (becomes more acidic), the buffers in the cell “accept” the hydrogen ions which reverses the pH change.
When a cell’s pH rises (becomes more basic), the buffers in the cell “ donate” hydrogen ions.
In a cell, acid is being produced as the cell respires. To maintain the pH, a cell must use buffers to counteract the acid.
Different cells or areas of the organism need different pH levels to perform. Buffers help keep that pH level constant.
Ex: The stomach of a human maintains a pH of , but the blood of a human must remain between 6.8 and 7.8. This requires different buffers in the stomach and blood.

19. pH Scale – Written Response #4
Draw a diagram of the pH scale. Make sure you include the following:
The scale 1-14.
Label and color the following strong acid, weak acid, neutral, weak base, strong base.

20. Biomolecules Wrap Up
Click very dark link above.

21. 2.1 pH Lab