Chapter 1 The Scientific Study of Life McGrawHill

What's the basic unit of life?

A cell

What are the 5 characteristics of life

1. Organization 2. Energy use 3. Homeostasis (maintain internal constancy) 4. Reproduction, Growth, Development 5. Evolution

What is a tissue?

A group of cells that interact for a specific function

What's an organ?

A group of two or more tissues that function as a unit

What's a population?

The same species occupying the same place at the same time

What's a community?

multiple populations in a region

What's an ecosystem?

The nonliving and living components of an area

What's the biosphere?

All the parts of the plant that support life aka the global ecosystem

What are emergent properties?

result from the arrangement and interaction of parts within a system

What are producers/autotrophs?

Organisms that make their own food from energy that comes from nonliving sources.

What are consumers/heterotrophs?

Organisms that get thier energy from eating other organisms either dead or alive

What are decomposers?

They are organisms that get their energy specifically from dead organisms

What are the two types of reproduction?

sexual and asexual

What is asexual reproduction?

when an offspring is produced from a single parent

What is sexual reproduction?

when an offspring is produced from two parents that combine their gentic information

What is evolution?

The change of genetic makeup over time

What are the three domains?

Bacteria, Archaea, Eukarya

What two domains are prokaryotes?

Domain Bacteria and Domain Archaea

What domain is a eukaryote?

Domain Eukarya

What is a prokaryote?

cell without a nucleus (DNA is free in the cell) or membrane bound organelles

What is a eukaryote?

cell with a nucleus

What are the steps of the scientific method?

1.Observation 2.Ask a question 3.Form Hypothesis (consult prior knowledge) 4.Make predictions 5.Collect/Interpret data 6.Draw conclusions(consult prior knowledge) 7.Peer review 8.Publish

A hypothesis needs to be _____________ and _____________.

Testable, falsifiable

Can a hypothesis be proven?

No, only supported

What is a theory?

well-tested explanation from a broad range of observations

What's an independent variable?

The one condition in the experiment that is tested.

What's a dependent variable?

The part of the experiment that changes in response to the changes you made the the independent variable. Also, what is measured.

What is a control group?

The group that does not receive the experimental treatment in an experiment.

What is a control variable?

the variable that stays the same throughout the experiment