Sb1 Key Concepts in Biology

Question 1

What is the most common microscope?

Answer 1

One that contains two lenses which was invented at the end of the 16th century. Robert Hooke used this microscope to discover cells 1665.

Question 2

How do you workout a microscopes magnification?

Answer 2

Multiply the eye piece lens and the objective lens

Question 3

What is the resolution in a microscope?

Answer 3

The smallest distance between two points that can still be seen as two points

Question 4

How do electron microscopes work?

Answer 4

Beams of electrons pass through the specimen creating an image. The microscopes can magnify up to x2000000 and with resolutions down to 0.0000002mm.

Question 5

Nucleas

Answer 5

The Nucleas controls the cell and it’s activities. Inside it are chromosomes which contain DNA. It is especially large in white blood cells.

Question 6

Cell membrane

Answer 6

It is like a very thin bag. It controls what enters and leaves, and separates one cell from another.

Question 7

Cytoplasm

Answer 7

Contains a watery jelly and where most of the cell activities occur

Question 8

Mitochondria

Answer 8

Power house of the cell were aerobic respiration occur