Module 2 Cell Structure Exam Qs

Question 1

Which of the options, A to D, occurs in the nucleus of the cells 1 mark v

Answer 1

B, synthesis of RNA

Question 2

Which of the following statements describes an organelle which is not membrane bound 1 mark

Answer 2

D, is made of rRNA and protein= ribosomes are not membrane bound

Question 3

Which microscope X,Y,Z is a transmission microscope, x=x1500, 200nm, Y=x100,000, 20nm, X=x500,000, 1nm. 1 mark

Answer 3

Z, highest magnification

Question 4

Which microscope X,Y,Z is a transmission microscope, x=x1500, 200nm, Y=x100,000, 20nm, X=x500,000, 1nm

Answer 4

Z, highest magnification

Question 5

Explain how to measure the diameter of the nucleus of one of the white blood cells, when observing the cells through a light microscope. 4 marks

Answer 5

Use eyepiece graticule, measure diameter of nucleus in EPU, take repeat measurements and mean, calculate length of 1EPU using stage micrometer

Question 6

What is image appearance of scanning/transmission and colour of scanning. 2 marks

Answer 6

Scanning=3D, black and white. Transmission=2D

Question 7

A transmission electron microscope image of a white blood cell was studied. It was concluded that the cell had stopped dividing at G2 checkpoint. Suggest 2 observations that would have led to this conclusion. 2 marks

Answer 7

Larger number of organelles, more DNA

Question 8

The rough endoplasmic reticulum is where translation of some proteins takes place in eukaryote cell. Explain the role of the membrane in the rough endoplasmic reticulum. 2 marks

Answer 8

Separating proteins, hold ribosomes in place

Question 9

Give 2 structural features of mitochondria that support the endosymbiosis theory. 2 marks

Answer 9

Double membranes, contains 70s ribosomes

Question 10

Explain why early eukaryotes were able to grow more quickly than cells that did not posses mitochondria. 3 marks

Answer 10

Respire aerobically, produce more ATP, needed for active transport

Question 11

Give 2 improvements of staining sample. 2 marks

Answer 11

Use More than 1 stain, place cover slip at angle and make sure no bubbles

Question 12

Name one type of extracellular protein secreted at secretory vesicle 1 mark

Answer 12

Enzyme

Question 13

Suggest one stage during secretion of proteins that requires energy. 1 mark

Answer 13

Exocytosis, fusing vesicles to membrane