Science (Fascinating cell facts)

Question 1

How many cells are there in the human body?

Answer 1

about 10 trillion

Question 2

1. How many bacterial cells are there in the human body?

2. Where are most of them situated?

Answer 2

1. 100 trillion

2. Digestive tract

Question 3

1. What does the light microscope do?

2. How much can it magnify?

Answer 3

1. uses light and lenses to magnify object

2. 2000x

Question 4

1. How does an electron microscope magnify?

2. How much can it magnify?

Answer 4

1. uses a beam of electrons to magnify objects

2. 10 000 000x

Question 5

What are the differences between eukaryotic and prokaryotic cells?

Answer 5

Eukaryotic cells:
-contain a membrane-bound nucleus
-all multi- and unicellular organisms are eukaryotic
Prokaryotic cells:
-don't have a membrane-bound nucleus
-bacteria (most unicellular)

Question 6

1. What kind of mammalian cells have no nucleus, DNA or organelles when they are mature?
2. What can’t they do because of this?
3. How many red blood cells are produced per second?
4. Where are RBCs made?

Answer 6

1. red blood cells
2. make copies of themselves
3. millions
4. bone marrow

Question 7

1. How many of your cells die per day?

2. What is programmed cell death called?

Answer 7

1. billions

2. apoptosis

Question 8

1. How is cancer characterized?
2. What sometimes happens to cells when they are damaged?
3. What are the two kinds of tumors?

Answer 8

1. cells that grow out of control
2. they do not die when they should and instead form large growths called tumors
3. malignant (spread to other areas of the body) benign (don’t)

Question 9

1. What was taken from Henrietta Lacks and when?

2. What is an immortal cell line?

Answer 9

1. cancerous cells in 1951

2. cells that are able to grow and divide indefinitely

Question 10

1. What are the two types of stem cells?

2. Why are stem cells “exciting”?

Answer 10

1. embryonic and adult

2. they may be able to be used to generate new cells or tissues to treat human disease or injury