Biology Semester 1 Ezam Review

Living things

Require energy to carry on life processes.

Have the ability to reproduce.

Are composed of cells.

All of the above

As a characteristic of all living things, homeostasis relates most directly to which of the following biological themes?

Interacting systems

Evolution

Stability

Scale and structure

Scientists usually design experiments

With a good idea of the expected experimental results

Based on wild guesses

In order to develop new laboratory tools

All of the above

A substance that is composed of only one type of atom is called a(n)

Nucleus

Element

Cell

Molecule

Ionic bonds form between molecules that have

Opposite charges

No charges

The same charge

Neutral charges

Sharing of electrons in the outer energy levels of two atoms

Results in ion formation

Occurs in covalent bonds

Only occurs if both are atoms of the same element

Is found only among carbon atoms

Water is important to life because it

Surrounds all cells

Infound inside cells

Influences the shape of the cell membrane

All of the above

Nonpolar molecues have

No negative or positive poles

Only a negative pole

Both negative and positive poles

Only a negative ole

All organic compounds contain the element

Carbon

Calcium

Nitrogen

Sodium

Which of the following organic molecules are most closely related to nucleic acids?

Amino acids

Nucleotides

Fatty acids

Sugars

The molecule on which an enzyme act is called a(n)

Active site

Organic molecule

Inactive site

Substrate

A cell contians

Thousands of different kinds of enzymes, each promoting a different chemical reaction

One kind of enzyme that promotes thousands of different chemical reactions

Approximately 100 kinds of enzymes, each promoting a different chemical reaction

One enzyme that promotes photosynthesis and one enzyme tht promotes cellular respiration

Fuzzy images viewed with a microscope may be due to poor

Resolution

Magnification

Amplification

None of the above

The smallest units of life are

Cells

Chloroplasts

Mitochondria

None of the above

One difference between prokaryotes re eukaryotes is that

Nucleic acids are found only in prokaryotes

Mitochondria are found in larger quantities in eukaryotes

Golgi vesicles are found only in procaryotes

Prokaryotes do not have a nucleus

Which of the following is characteristic of prokaryotes?

They have a nucleus

Their evolution proceded that of eukaryotes

The organelles in their cytoplasm are surrounded by membranes

None of the above

A structure within a eukaryotic cell that performs a specific function is called a(n)

Organelle

Tissue

Organ tissue

Biocenter

Most of the food and waste materials that move into and out of a cell pass through

Receptor proteins

Enzymes

Marker proteins

Channel proteins

The structure that regulates what enters and leaves the cell is the

Nucleus

Nuclear membrane

Cell wall

Cell membrane

As a result of diffusion, the concentration of many types of substances

Always remains greater inside a membrane

Eventually becomes balanced on both sides of a membrane

Always remains greater outside of a membrane

Becomes inbalanced on both sides of a membrane

Proteins that act like selective passageways in the cell membrane are known as

Marker proteins

Receptor proteins

Channel proteins

None of the above

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