BIOS 251 TEST 1 NOTES

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BIOS 251 TEST 1 NOTES

• What is matter?

–Answer Anything that has mass and takes up space

• What are molecules?

–Answer A group of atoms bonded together

• What is energy?

–Answer The ability to do work or cause change

• What is the universe made of?

–Answer Energy and matter

• True or False. The total amount of energy/ matter in the universe is con- stant.

–Answer True

• What happens to the energy when the universe continually expands as it does?

–Answer The volume in space will increase constantly, meaning that we'll have the same amount of energy and it'll fill the new space, resulting in a decrease in the density of the energy.

• What is diffusion?

–Answer High to low, it is the net movement from a volume of greater concentration to a volume of lesser concentration.

• What holds matter together?

–Answer The four fundamental interactions of the universe.

• What are the four fundamental interactions of the universe from strongest to weakest? 1 / 2

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–Answer Strong nuclear interaction, electromagnetic interaction, weak nuclear interaction and gravity

• Which interaction is intrinsic to living systems?

–Answer electromagnetic interaction

• What are the levels of organization within non living matter?

–Answer Elementary particles, subatomic particles, atoms, molecules, small biological molecules and biological macromolecules

• What are the levels of organization within living matter?

–Answer Cells, Tissues, Organs, organ systems and organisms

• What are the three subatomic particles?

–Answer Protons, neutrons, and electrons

• What is the mass of an electron?

–Answer 9.11 x 10^-31 kg

• What is the mass of a neutron?

–Answer 1.675 x 10^-27 kg

• What is the mass of a proton?

–Answer 1.673 x 10^-27 kg

• What part of an atom is important in biological systems?

–Answer Electrons be- cause they carry energy that can be used.

• What keeps protons in the middle?

–Answer Strong nuclear interaction

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