Grade 11 Unit 4

Question 1

T/F
Osmosis is responsible for everyday life phenomena

Answer 1

T

Question 2

T/F
Size of a cell changes by osmosis because of the inflow and outflow of water

Answer 2

T

Question 3

second lens (the ………) magnifi es the already magnified image produced by the objective lens.

Answer 3

eyepiece

Question 4

The first compound microscope was made in 1595 by the Dutch scientist

Answer 4

Zaccharias Jansen

Question 5

What’s the use of eyepiece lens?

Answer 5

magnifies the already magnified image produced by the objective lens. However, it also magnifies any ‘aberrations’ or faults in the image

Question 6

The French biologist …………. concludes that all organisms are composed of cells

Answer 6

Rene Dutrochet

Question 7

Who discovered the stomata in the epidermis of leaves, the process of osmosis, chlorophyll is needed for photosynthesis to occur, respiration occurs in both animals and plants

Answer 7

Rene Dutrochet

Question 8

Who is the man who first states the cell theory by recognising that all organisms are made of cells and that ‘all growth occurs because of the increase in volume of cells or by the addition of more little cells

Answer 8

Rene Dutrochet

Question 9

Who put forward the first clearly stated cell theory

Answer 9

Matthias Schleiden and Theodor Schwann

Question 10

a German doctor who develops many surgical techniques and promotes several fields of modern medicine

Answer 10

Rudolf Virchow

Question 11

Who discovered protozoa

Answer 11

Leeuwenhoek

Question 12

Who described the cell nucleus in cells of an orchid

Answer 12

Brown

Question 13

Who described mitochondria

Answer 13

Kolliker

Question 14

Who isolates DNA

Answer 14

Miescher

Question 15

Who described chromosome behaviour during mitosis

Answer 15

Fleming

Question 16

correlate the readings of an instrument with a standard

Answer 16

calibrating

Question 17

……… determines how much activity there is in a cell

Answer 17

volume

Question 18

The amount of energy that must be released in respiration is therefore decided largely by the …….

Answer 18

volume

Question 19

membranes of the ………. separate areas of the cytoplasm and allow them to function independently

Answer 19

endoplasmic reticulum

Question 20

individual structures in a cell with a specific function

Answer 20

organelles

Question 21

the network of membranes in a cell

Answer 21

endoplasmic reticulum

Question 22

the endosymbiont theory was first proposed by the biologist ………

Answer 22

Lynn Margulis

Question 23

The forerunners of animal, fungal and protoctistan cells

Answer 23

heterotrophic

Question 24

What is the importance of the cell membrane?

Answer 24

1. Controls what goes in n out
2. Cell signaling (recognition by hormones n immune system)

Question 25

T/F A plasma membrane is much more complex than a simple bilayer

Answer 25

T

Question 26

Who suggested that all membranes are essentially the same

Answer 26

J D Robertson

Question 27

........... are conceptual plans of some system that try to explain experimental observations and relate the various observations to each other

Answer 27

Models

Question 28

integral proteins with pores that allow ions to pass through the membrane

Answer 28

channel protein

Question 29

integral proteins that move mediumsized particles across the membrane

Answer 29

carrier proteins

Question 30

Not all particles can actually pass through a plasma membrane unaided. This is because..........

Answer 30

because of the largely lipid nature of the membrane

Question 31

proteins that span only one of the two phospholipid layers

Answer 31

peripheral proteins

Question 32

Carrier proteins involved in active transport are often referred to as ..........

Answer 32

pumps

Question 33

proteins that span both phospholipid layers in a plasma membrane

Answer 33

integral proteins

Question 34

Based on electron microscope evidence that appears to support the Davson–Danielli model, ........... proposes the unit membrane model

Answer 34

J D Robertson

Question 35

The rate of facilitated diffusion is affected by the same factors that affect simple diffusion with the exception that.......

Answer 35

it is not the actual surface area of the membrane that determines the rate, but the number of carrier proteins (or channel proteins) present.

Question 36

.......... involves the creation of pseudopodia (extensions of the plasma membrane) to enclose large particles or even whole organisms outside the cell.

Answer 36

Phagocytosis

Question 37

Active process by which enzymes and hormones are secreted

Answer 37

Exocytosis

Question 38

.......... typically occupies about 10% of the volume of a cell

Answer 38

nucleus

Question 39

...... partial partitions in mitochondria

Answer 39

cristae

Question 40

where some of the reactions of aerobic respiration take place in mitochondria

Answer 40

fluid matrix

Question 41

is the ‘energy storage molecule’ of cells

Answer 41

ATP

Question 42

Each ribosome comprises two subunits that are made from ......... n manufactured in the ........

Answer 42

RNA and protein. Nucleolus

Question 43

Many of the modifications added in the ............ act as a kind of ‘tag’, which determine the final destination of the molecule

Answer 43

Golgi apparatus

Question 44

Think of the .......... as a cellular post office that labels and then distributes molecules!

Answer 44

Golgi apparatus

Question 45

Think of the .......... as a cellular post office that labels and then distributes molecules!

Answer 45

Golgi apparatus

Question 46

....... have no specialised internal structure and are surrounded by a single membrane

Answer 46

Lysosomes

Question 47

....... have no specialised internal structure and are surrounded by a single membrane

Answer 47

Lysosomes

Question 48

Where is lysosome formed

Answer 48

In golgi apparatus

Question 49

are particularly abundant in phagocytic white blood cells

Answer 49

Lysosomes

Question 50

T/F All eukaryotic cells are the same

Answer 50

F

Question 51

What in the cell wall gives it both strength and elasticity

Answer 51

The criss-cross arrangement of cellulose fibres

Question 52

Why, the cell wall is freely permeable

Answer 52

Because there are large ‘gaps’ (on a molecular scale) between the fibres

Question 53

............ separates the components of a cell by centrifugation, heavier organelles being isolated at lower centrifuge speeds.

Answer 53

Cell fractionation

Question 54

Unit in which the size of cells and cell organelles is measured

Answer 54

Micrometer