A logical explanation supported by tests & observations.

Hereditary characteristics are:

Transmitted on genes located on chromosomes.

Facilitated diffusion:

substances diffuse into cell thru. channels in cell membrane

A controlled experiment ...

Has identical conditions between samples (except variables)

The correct sequence of organization levels, from simplest to most complex:

Cell➡️ tissue➡️ organ➡️ organ system.

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Biology Essentials

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Basics of biology.

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Questions 14

Answers

1
What is a theory?
A logical explanation supported by tests & observations.
A scientific truth.
An explanation for preliminary observations.
Something that cannot be falsified.
2
Organisms are...
Parts of a cell.
Microscopic.
Animals, not plants.
Individual living creatures.
3
A transport mechanism that requires energy is...
Passive transport.
Diffusion.
Osmosis.
Active transport.
4
Hereditary characteristics are:
Transmitted on chromosomes located on genes.
Characteristics that are not passed on to offspring.
Transmitted on genes located on chromosomes.
Dependent on only one parent.
5
Which of the following classes of macromolecules do biological catalysts belong?
Proteins.
Lipids.
Carbohydrates.
Nucleic acids.
6
Biology is the study of...
Anatomy.
All of the above.
Interactions between plants and animals.
Cells.
7
A solution is a kind of...
Water.
Molecule.
Enzyme.
Mixture.
8
All energy to fuel life on Earth ultimately comes from...
The sun.
ADP.
ATP.
Respiration.
9
If an atom looses an electron, it becomes a...
Positive ion.
Negative ion.
Neutral atom.
Covalent atom.
10
Facilitated diffusion:
Is a form of active transport.
Allows only water to cross selectively permeable membrane.
substances diffuse into cell thru. channels in cell membrane
movement of substance from areas of high ➡️ low concentration
11
Meiosis is an important process because it produces...
Genetic variation.
Bigger organisms.
Many individual cells.
Diploid cells.
12
A controlled experiment ...
Is the only way that scientists test hypotheses.
Proves a variable caused a change
Uses a control group treated w/ a variable to see change.
Has identical conditions between samples (except variables)
13
The correct sequence of organization levels, from simplest to most complex:
Organ➡️ organ system➡️ tissue➡️cell.
Cell➡️ tissue➡️ organ➡️ organ system.
Cell ➡️ tissue➡️ organ system➡️ organ.
Organ system➡️ organ➡️ tissue➡️cell.
14
An atom is correctly described as...
An electrically neutral object.
All of the above.
Neutrons and protons with orbiting electrons.
A nucleus with orbiting electrons.

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