F3T2 Bio 3 Cells

What does this show about the nature of science? Before the invention of the microscope, people know little about cells or microscopic organisms

• Scientific development relies on the technology available at the time
• Scientists build on the work of previous scientists
• Development of scientific knowledge involves cooperation / competition between scientists
• Show that scientific knowledge is tentative and is subject to change whenever new evidence appears

T/F: Transmission electron microscope is essential for revealing the detailed internal structures of a specimen

• T
• F

T/F: Electron microscopes cannot be used to look at biological process in living cells

• T
• F

T/F: the body tube holds the objectives of different magnifications

• T
• F

Which of the following statements are false

• The image is dimmer at a high-power magnification
• You can see a smaller area at a low-power magnification
• The image is reversed upside down and from left to right when viewed through a microscope
• Magnification is equal to the size of the specimen in the image divided by the actual size of the specimen

Which of the following statements are true

• The cell membrane is made of lipids only
• You can see all organelles of a cell with a light microscope
• Cells are the smallest functioning unit of life
• A virus is a cell

Which of the following about the nucleus is not true

• It is surrounded by a double membrane
• A nucleolus is involved in making ribosomes
• There are nuclear pores on the nuclear membrane
• All cells have at least one nucleus

Which is true about endoplasmic reticulum

• Smooth ER have ribosomes attatched to it
• Rouch ER is present in larger amounts in lipid-secreting cells
• It comes from the outer membrane of the nucleus
• It is highly folded to form finger-like projections

Which organelle is rod-shapped and surrounded by a double membrane

• Mitochondrion
• Vacuole
• Endoplasmic reticulum
• Nucleus

Which organelle is the site of protein synthesis

• Ribosomes
• Mitochondrion
• Nucleus
• Endoplasmic reticulum