Biology- animal and plant cell

Question 1

function cytoplasm

Answer 1

medium for biochemical reaction to take place

Question 2

functions of cytoplasm

Answer 2

a jelly like medium which is present between the nucleus and the cell membrane

Question 3

function of nucleus

Answer 3

controls all activities in the cell

Question 4

Characteristics of nucleus

Answer 4

-largest component in thr cell
- contains genetic material DNA

Question 5

Function of mithochondrion

Answer 5

generates energy through cellular respiration

Question 6

Characteristics of mithochondrion

Answer 6

-rod shaped component
- consists of two layers of membrane : smooth outer
: folded inner

Question 7

Characteristics of centriole

Answer 7

-small cylindrical components
-made up of complex arrangement of microtubules

Question 8

function of centriole

Answer 8

from spindle fibre during cell division in animals

Question 9

Characteristics of Golgi apparatus

Answer 9

consists a sack of parallel flattened sacs that are coated by a single cell of membrane

Question 10

function of Golgi apparatus

Answer 10

modifies ,packs and transports chemicals such as proteins carbohydrates and glycoprotein

Question 11

Characteristics of plasma membrane

Answer 11

-thin and elastic film
-partially permeable
-made up of protein and phospholipids

Question 12

Function of plasma membrane

Answer 12

-separates content of cell from the external environment
-contorols movements in and out of cell

Question 13

Characteristics of lysosomes

Answer 13

-small spherical sac that contains hydrolytic enzymes

Question 14

Function of lysosomes

Answer 14

breaks down bacteria and components of damaged cells

Question 15

Characteristics of ribosome

Answer 15

-small,ccompact and spherical granules
-consists of protein and ribonucleic acid
-present on the surface of the rough endoplasmic recticulum or exits freely in the cytoplasm

Question 16

Function of ribosome

Answer 16

site for protein synthesis

Question 17

Characteristics of endoplasmic reticulum

Answer 17

• a network of interconnected membrane -bounded sac
  -consist of two types
  :smooth endoplasmic reticulum
  (with ribosomes attached)
  :rough endoplasmic reticulum
  (with no ribosomes attached)

Question 18

Function of endoplasmic recticulum

Answer 18

rer: transports proteins made by ribosomes
ser: involved in synthesis of lipids

Question 19

Characteristics of vocuole

Answer 19

-a liquid filled sac which is the cell sap
-surrounded by tonoplast membrane
-cell sap contains water, organic acids, sugars, amino acids, enzymes, mineral salt, enzymes, oxygen, carbon dioxide and metabolic by products

Question 20

function of vacuole

Answer 20

-water into vocuole plant cell and the cell becomes turgid
-in a unicellular animals the voucuole contracts during osmoregulation, osmosis and excretion

Question 21

Characteristics of chloroplast

Answer 21

-oval shaped
-two layers of membrane
-contaisn chlorophyll pigments in the grana that gives the plant a green colour

Question 22

Function of chloroplast

Answer 22

absorbs sunlight and converts it to chemical energy during photosynthesis

Question 23

Characteristics of cell wall

Answer 23

-strong rigid outer layer
-made up of cellulose fibre and is fully permeable

Question 24

function of cell wall

Answer 24

-mantains shape of plant cell
- provides support to plant cell