Unit 1

Who is credited with first observing and naming cells?

• Antonie van Leeuwenhoek

• Rudolf Virchow

• Theodor Schwann

• Robert Hooke

Antonie van Leeuwenhoek is best known for:

• Inventing the cell theory

• Observing microorganisms using a microscope

• Proposing that cells arise from preexisting cells

• Naming the nucleus of the cell

Which statement is NOT a tenet of cell theory?

• All organisms consist of one or more cells

• The cell is the basic unit of life

• Cells can arise spontaneously under certain conditions

• All cells arise from preexisting cells

The first scientist to describe cells as "structural units of life" was:

• Antonie van Leeuwenhoek

• Theodor Schwann

• Robert Hooke

• Rudolf Virchow

Who proposed the first two tenets of the cell theory?

• Antonie van Leeuwenhoek

• Theodor Schwann

• Robert Hooke

• Rudolf Virchow

Which of the following is the third tenet of the cell theory, added by Rudolf Virchow?

• All cells have a nucleus

• All cells arise from preexisting cells

• All organisms are made up of multiple cells

• All cells are identical

Which technique allows scientists to monitor gene expression in living cells?

• Confocal microscopy

• GFP fluorescence

• Light microscopy

• Atomic force microscopy

What is one major advantage of expressing the human antithrombin gene in goat milk?

• It provides a source of antibiotics for humans

• It can produce large quantities of a blood-clotting prevention protein

• It helps in growing human tissues

• It enables the production of human growth hormone