1. What is Biology? What is life?

2. Biology The science that deals with living things.
Studying biology teaches us to ask questions, make observations, evaluate evidence, and solve problems.
Biologists learn how living things work, how they interact with one another, and how they evolve.
Whenever you see “ology” or “logy” it means the study of . . .
“bios” means life, so the general meaning of biology is the study of living things.

3. Some fields in biology Botany Zoology Anatomy Bacteriology Cytology
Ecology
Entomology
Herpetology
Histology
Ichthyology
Mycology
Cytology – cells
Entomology - bugs
Herpetology – amphibians
Histology - tissues
Ichtyology – fish
Mycology – fungi

4. Characteristics of Living Things
Show movement
Respond to stimuli
Maintain stable internal condition (homeostasis)
Are composed of cells
Grow and develop
Adapt
Reproduce
Universal genetic code
Require water and energy
Excrete energy, waste, and organic products

5. Cells
A Cell is the smallest units of an organism that can be considered alive.
Lets look at some cells . . .
Some living things are made up of only
once cell – called UNICELLULAR
Organisms that are made up of several cells working together are called MULTICELLULAR
Find cell examples to look at under the microscope.

6. Reproduction
Sexual Reproduction – two cells from different parents unit to make the first cell of the new organism
For example: egg and sperm unit to make your first cell
Asexual Reproduction – the new cell comes from one parent.
Generally produces an organism that is identical to its parent (a clone!!)

7. More Vocab
Metabolism – chemical reactions in which the organism builds up and breaks down materials to carry out life processes.
What does it mean to have a high metabolism?
Homeostasis – process of keeping internal
conditions fairly stable or constant
Temperature, water content, pH, etc.
Stimulus (Stimuli) – any signal that an organism can respond to. (temperature, light, sound, internal stimuli.
Evolution – change over time (over several years!)

8. How does …. Respond to stimuli? Maintain Homeostasis ? Adapt?
Have universal genetic code?

9. Viruses
What are they? – Particles of nucleic acids, proteins, and sometimes lipids that must infect other cells to reproduce.
Made up of protein coat (called a CAPSID) and
DNA or RNA
Infecting the cell can cause disease
Similar to some bacteria but viruses tend to be smaller and harder to treat.
Cannot be treated with antibiotics
Can prevent some with vaccines
Vaccines are weakened or dead versions of the virus that the body is exposed to so that it can prepare a defense in the case of infection
Virus coloring?

11. Virus “Life” Cycle

12. Are Viruses Living? NO!!!

13. Living or not Independent Practice: Answer questions on page 31
Yes No
Independent Practice:
Answer questions on page 31
#8, 9, 21,23

14. Summary
What is one thing you learned that surprised you? Or something new that you learned?
What is one thing you already knew or could connect with from previous knowledge?

15. Essential Question 1 What does it mean if we say something is “alive”
What are some traits we would look for?
If we found a new “organism” on Mars what would help us classify it as a living or non-living thing?
Is it easy to tell if something is living?
Give examples and ask them to tell if it is living or not

16. Essential Question 2
Knowing now what biology is, what do you expect to do/study in this class for the rest of the semester?
Do you think biology will be useful for you in your career? Life?
Why or why not?

17. Essential Questions 3
Do you think viruses should be considered living things?
Why or why not?
What makes a virus different from a bacteria?
Add virus pictures and virus cycle