Instead of Study Guide, answer section reviews:

1.1 # 1-2 1.2 # 1-4 1.3 # 1-4 1.4 # 4-5 1.5 # 1-2, 6

15 Problems Total – Due by Friday 9/2

Biology in the 21st Century

Life is found everywhere….Think of the most obscure place you think life might beYellowstone PoolsBottom of the Ocean Ice in Antarctica

All living things and the places they are found on Earth is the biosphere

Biodiversity is the variety of life in an area Increases from poles to the equatorWhy would it be greater closer to the

equator? 2 million species that we know of…but…

10,000 more discovered every year50,000 go extinct every year

1. All organisms are made up of one or more cells

2. All organisms need a source of energy for their life processes

3. All organisms react to their environment- Why is this important?

4. All organisms have the ability to reproduce- Why is this important?

All levels of biology have systems (organized group of related parts that interact to form a whole) What are some examples?

Circulatory System Two Organisms that Interact in Ecosystem

Describe how your Biology class may be considered a system.

The structure and function of things are related Molars vs. incisors Red blood cells vs. brain cells

Organisms must maintain homeostasisMaintained in 2 ways

Negative feedbacka change in a system causes a response that

brings things back to “normal” Behavior

Reptiles sitting in the sun Eating to get your blood sugar back up

Evolution – the change in living things over timeHelps explain diversity

All scientific inquiry starts with observation which can be gathered as Qualitative data

Objective Descriptions such as Sights, sounds, smells

Quantitative data Numeric measurements such as mass, volume,

numbers, temperature, frequencyFrom the picture on the next slide, come up

with 3 quantitative and 3 qualitative pieces of information

Qualitative Examples:-Range in color from gray to white-Pod engaging in play behavior

Quantitative Examples:-Eight Dolphins- Each of the eight Dolphin has one dorsal fin

Before we move on to Section 4 and 5, please write a summary your notes thus far... Make sure you address the following concepts:

1. Independent and Dependent Variables2. Control group3. Steps in the Scientific Method4. Qualitative vs Quantitative observations5. Homeostasis6. Characteristics of living organisms

You will get 5 minutes to write, so get started now!

Be prepared to read your summary!

A microscope provides an enlarged image of an object.– light microscopes (LM)

stoma

stoma

A microscope provides an enlarged image of an object. scanning electron microscopes (SEM)Shows 3-dimensional views

stoma

• A microscope provides an enlarged image of an object.– transmission electron microscopes (TEM)– Shows a 2–dimensional image

Imaging technology is used in medicine.X-ray imagesShows dense

tissues, such as bones

• Imaging technology is used in medicine.– magnetic resonance imaging (MRI)

– Shows soft and dense tissues

functional MRI (fMRI)Shows areas of the brain are active while a

person does a particular task

Computer models are used to study systems that cannot be studied directly.heart attackseffect of medicines on the

human body– movement of water molecules

into and out of a cell– spread of a disease through a

population• Computer models are used

when experiments are not safe, ethical, or practical.

Normal heartbeat

Heart attack

®1.5 Knowledge of biology helps you understand your health.

food allergies potential effects of obesityeffects of alcohol, tobacco, and other drugscancer

brain

lungs

heart

liver

kidneys

Why use sunscreen?Why exercise?Effects of smoking, alcohol, drugs

Knowledge of biology can help you understand environmental issues.® interactions in ecosystems® Pollution® biodiversity

What kinds of environmental pressures may have caused the deformities in this frog? Could the same pressures affect humans?

DNA testing in medicine and forensics

• Biotechnology is the use and application of living things and biological processes.

– transgenic (genetically modified) crops– transgenic bacteria

Questions are raised about the use of biotechnology.

– spread of undesirable genes– decrease in biodiversity– ethical considerations

– safety of genetically modified crops

Over the past 50 years, biological knowledge has greatly increased.

Methane Worms

There are still many questions to answer in biology.

– How are memories stored in the brain?

There are still many questions to answer in biology.

surface proteins

lipid

envelope

nucleic acid capsid

– Does life exist on planets other than Earth?

– How do viruses mutate?