Chapter 1 - Life Processes

Question 1

Areobic respiration word equation

Answer 1

glucose + oxygen –> carbon dioxide + water (+energy)

Question 2

what are multicelluar organisms

Answer 2

complex organisms made up of many cells

Question 3

4 elements of the cell structure in an animal cell

Answer 3

cell membrane
cytoplasm
nucleus
mitochondria

Question 4

8 features of a plant cell

Answer 4

cell wall
cell membrane
choroplast
mitochondria
vacuole
nucleus
cytoplasm

Question 5

whats a cytoplasm

Answer 5

contains organelles

sloppy texture

Question 6

what does the nucleus do

Answer 6

controls all the activities that take place in the cell

largest part of the cell

Question 7

what do chromosomes do

Answer 7

inside a nucleus

carry genes that decide which proteins to make

Question 8

what does cell surface membrane do

Answer 8

like skin
forms boundary between cytoplasm and outside
selectively permable

Question 9

what does mitochondria do

Answer 9

provides energy for cell by respiration reactions

Question 10

what does the cell wall do

Answer 10

helps cell keep it’s shape
freely permeable
non living
made of celluse

Question 11

what do chloroplasts do

Answer 11

site of photosynthesis

Question 12

what does the vacuole do

Answer 12

contains all sap which helps keep the cells shape

Question 13

6 facts on enzymes

Answer 13

speed up biological chemical reactions
biological catalyst
made of proteins
can be intracellular (take place in reactions inside the cell) and extracellular (take place in reactions outside the cell)
have specific shapes

Question 14

how does an enzyme work

Answer 14

active site is complementary to the shape of it’s substrate
Fit together like lock and key
Splits into a number of separate product molecule

Question 15

whats the optimum temperature

Answer 15

the temperature that an enzyme works best at

Question 16

when will an enzyme denature

Answer 16

when the temperature is increased above its optimum temp
OR
when the pH is too high or too low

Question 17

what happens to a denatured enzymeq

Answer 17

it cannot function properly due to a change in shape the substrate can no longer fit into it’s active site

Question 18

explain experiment on change in temp and effect on enzymes

Answer 18

Puts iodine into a spotting tile - detects starch
The starch solution and amylase is mix and then heated at different temperatures to find out what temp the enzyme works best at. Turns blue black in presence of starch

Question 19

4 things we need respiration for

Answer 19

muscle contraction - movement
active transportation of molecules and ions
building of large molecules such as proteins
cell division

Question 20

symbolic equation for aerobic respiration

Answer 20

C6H12O6 + 6O2 –>6CO2 + 6H20 (+energy)

Question 21

what’s anaerobic respiration

Answer 21

when some cells can respire without oxygen

Question 22

Example anaerobic respiration in yeast cells with equations

Answer 22

fermentation and baking of bread, carbon dioxide makes bread rise
glucose–> ethanol + carbon dioxide (+energy)
C6H12O6 –>2C2H5OH + 2CO2 (+energy)

Question 23

anaerobic respiration in muscle cells

Answer 23

if overworked blood cannot carry the oxygen quick enough
in burst of exercise
glucose is broken into lactic acid
glucose –> lactic acid (+energy)
C6H12O6 –> 2C3H6O3 (+energy)
if goes on for a longer period of time lactic acid builds up and causes cramps. you have to rest until the lactic acid is oxidised.

Question 24

whats the oxygen debt

Answer 24

the amount of oxygen needed to completely oxidise the lactic acid that has built up in the body

Question 25

Mrs C Gren

Answer 25

Movement
Respiration
Sensitivity
Control 
Growth
Reproduction
Exctretion
Nuitrition