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Exam (elaborations)

Exam (elaborations) Biology Penn Foster

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ENTAILS QUESTIONS AND ANSWERS

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,Characteristics of living things - CORRECT ANSWERS--All are composed of cells
-All obtain energy and use it to develop
-Can sense changes in the environment and adjust in response to change
-Exhibit modifications that represent adaptations to their environment

Levels of Biological Organization - CORRECT ANSWERS-atom, molecule, organelle,
cell, tissue, organ, organ system, organism

How are organisms classified? - CORRECT ANSWERS-on the basis of their
evolutionary/genetic relatedness

What is the scientific method? What is it's importance in biological sciences? -
CORRECT ANSWERS-Process used to validate observations while minimizing
observer bias

It's goal is for research to be conduced in a fair, unbiased and repeatable manner. The
best way to discover how and why the world works

What is matter? - CORRECT ANSWERS-Anything that has mass and takes up space

What is an atom? - CORRECT ANSWERS-smallest unit of matter that retains all the
chemical properties of an element. They combine to form molecules which then form
into a solid, gas or liquid

What is the structure of an atom? - CORRECT ANSWERS-Nucleus in the center that
contains protons (positively charged) and neutrons (no charge). The outermost region is
called an electron shell that contain the electrons (negatively charged)

What is an ionic bond? - CORRECT ANSWERS-A chemical bond that's formed when
an atom transfers and electron to another Atom

, What is a covalent bond? - CORRECT ANSWERS-Results when 2 atoms share
electrons in order to have a completed outer shell

What is a double covalent bond? - CORRECT ANSWERS-Occurs when 2 atoms share
2 pairs of electroms

In order to be an organic molecule it must contain what? - CORRECT ANSWERS-
Carbon and hydrogen

What are the main groups of organic molecules that build cells and their parts? -
CORRECT ANSWERS-Carbohydrates, proteins, lipids, nucleic acid

What are the properties of water? - CORRECT ANSWERS-Its attraction to polar
molecules.
High-specific heat.
High heat of vaporization.
The lower density of ice.
High polarity.

Carbohydrates - CORRECT ANSWERS-Broken down to glucose to provide energy.

What are the different kinds of carbs? - CORRECT ANSWERS-Glucose=
monosaccharide that serves as blood sugar
Sucrose= disaccharide which is table sugar
Polysaccharides= include starch, which stores energy in plants
Glycogen= stores energy in animals
Cellulose= makes up the structure of plant cell walls

Protein - CORRECT ANSWERS-macromolecule that contains carbon, hydrogen,
oxygen, and nitrogen; needed by the body for growth and repair

Lipid - CORRECT ANSWERS-Energy-rich organic compounds, such as fats, oils, and
waxes, that are made of carbon, hydrogen, and oxygen.
Serve as a long term energy source

Nucleic acid - CORRECT ANSWERS-macromolecule containing hydrogen, oxygen,
nitrogen, carbon, and phosphorus
Form DNA which acts to store genetic information

What is the cell theory? - CORRECT ANSWERS-All living organisms are made up of
cells
The cell is the smallest structural and functional unit of all living organisms
All cells arise from pre-existing cells

Ribosome - CORRECT ANSWERS-Makes proteins

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