Biology (Day 7; Introduction to Cells)

Question 1

Cell theory

Answer 1

the explanation of the relationship between cells and all living organisms

Question 2

Simple light microscope

Answer 2

Instrument that uses visible light and one lens to magnify an object

Question 3

Compound light microscope

Answer 3

Instrument that uses visible light and multiple lenses to magnify an object

Question 4

Electron microscope

Answer 4

Instrument that uses a beam of electrons to create a magnified image

Question 5

What is the difference between Scanning and Transmission Electron Microscopy?

Answer 5

Scanning Electron Microscopy moves back and forth across the surface of a cell/tissue, whereas Transmission Electron Microscopy involves slicing the sample and using an electron beam to pass through the slice

Question 6

Robert Hooke

Answer 6

discovers dead cells through an early microscope

Question 7

Anton von Leeuwenhoek

Answer 7

develops a more powerful microscope that allows him to see living cells like bacteria

Question 8

Matthias Schleiden and Theodor Schwann

Answer 8

cells are the basic unit of life, all living things are made of one or more cells, and they proposed that all cells come from other cells (but didn’t confirm)

Question 9

Rudolf Virchow

Answer 9

confirmed that all cells come from other cells (there is evidence that he plagiarized from polish scientist Robert Remak)

Question 10

What does the modern cell theory state?

Answer 10

1. all living things are made of one or more cells
2. cells are the basic unit of life
3. all cells come from pre-existing cells

Question 11

Light microscope

Answer 11

Lower resolution and magnification, inexpensive (relatively small), uses visible light, and cells can be alive or dead

Question 12

Electron Microscope

Answer 12

Higher resolution and magnification, expensive (large), uses a beam of electrons, and cells have to be dead