B3f-growth And Development Flashcards Preview

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Flashcards in B3f-growth And Development Deck (22)
1

What is the function of the vacuole?

Contains cell sap
Provides support

2

What is the function of the cell wall?

Made of cellulose
Provides support

3

What is the difference between bacterial and plant and animal cells?

Bacterial cells lack
A true nucleus
Mitochondria
Chloroplasts

4

Whats the difference in dna of bacterial cell and plant/animal cell?

Bacteria has
No nucleus
Single circular strand of dna

5

What are the five main phases of growth?

Infancy
Childhood
Adolescence
Maturity/adulthood
Old age

6

Describe infancy

Just after birth
Roughly the first two years
Rapid growth

7

Describe childhood

Period between infancy and puberty
Steady growth

8

Describe adolescence

Begins with puberty and continues until body development and growth are complete
Rapid growth

9

Describe maturity/adulthood

Period between adolescence and old age
Growth stops

10

Describe old age

65 - death

11

How do you measure using length?

Measure length/ height of a plant or animal

12

What are the advantages and disadvantages of measuring growth by length?

Advantage:
Easy to measure

Disadvantage:
Doesn't tell you about changes in width, diameter, number of branches, etc

13

How do you measure growth by wet mass?

Weigh the plant or animal

14

What are the advantages and disadvantages of using wet mass?

Its very changeable
Animal would be heavier if they had just eaten

15

How do you measure using dry mass?

Dry out the organism before weighing it

16

What are the advantages and disadvantages of using dry mass?

Advantage:
Not affected by the amount of water in plant or animal

Disadvantage:
You have to kill the organism

17

What is differentiation?

The process of cells becoming specialised

18

What can undifferentiated stem cells develop into?

Cells , tissues and organs

19

What can stem cells be obtained from?

Embryonic tissue
Bone marrow(adult stem cells)

20

Whats the difference between adult and embryonic stem cells?

Adult stem cells arent as versatile

21

Why are some people agains stem cell research?

Embryos could be a potential human life
Others say that the embryos are donated and would otherwise be thrown away

22

How do plants and animals grow differently?

-animals grow til they reach a finite size then stop
-plants grow continously
-in animals, growth happens by cell division
-in plants, cell division is restricted to areas called meristems
-plants retain the ability to differentiate