Biology Unit 2: Cells Theory and Cell Structure and Function

Front

Why won't a theory become a law?

Back

Scientific theories are well-tested explanations; laws are well-tested descriptions of natural phenomena; one cannot become the other.

Answer explanation

Scientific Theories and Laws are two entirely different things. One cannot become the other. However, they can be modified and changed as new information/technology becomes available.

Front

Differences between prokaryotes and eukaryotes.

Back

Eukaryotic cells have a nucleus and membrane-bound organelles; prokaryotic cells lack these features.

Answer explanation

Pro means NO (no nucleus or membrane bound organelles)

EU means DO (do have nucleus and membrane bound organelles)

Front

Role of lysosomes in a cell?

Back

Breaks down waste and recycles digestion products.

Answer explanation

Front

Red blood cells in a hypertonic solution:

Back

Water leaves the cell by osmosis, causing shrinkage.

Answer explanation

Front

Organelle function mismatch: nucleus . . . lipid synthesis

Back

B) nucleus . . . lipid synthesis

Answer explanation

The nucleus is the "brain" of the cell. It contains DNA/genetic material and controls all functions of the cell.

Front

NOT part of cell theory:

Back

C. Cell parts like chloroplasts are self-replicating.

Answer explanation

Front

Principle of cell theory supporting cell replacement:

Back

All existing cells arise from previously existing cells.

Front

Why do all living organisms have ribosomes?

Back

Ribosomes are essential for making proteins coded by DNA.

Front

Cell structures in prokaryotes, animal, and plant cells?

Back

Cytoplasm and ribosomes

Answer explanation

Every cell needs cytoplasm to support the cell structures and dissolve nutrients and gases.

Every cell needs ribosomes to make proteins.

Front

Structures in plant cells not in animal cells:

Back

chloroplast, cell wall, central vacuole

Answer explanation