B1 Cell biology Flashcards Preview

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Flashcards in B1 Cell biology Deck (61)
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1

What are all living things made up of?

cells

2

What if the difference between a prokaryotic cell and a eukaryotic cell?

the prokaryotic cell has no neucleusProkaryote is simpler

3

What is the function of the nucleus?

To contain genetic material that controlling the activities the cell

4

What is the function of the cytoplasm?

The site where most chemical reactions happen

5

What is the function of the cell membrane?

To hold the cell together and controls what goes in and out

6

What is the function of the mitochondria?

to help with aerobic respiration

7

What is the function of the ribosomes?

To make proteins via protein synthasis

8

What type of cell are bacteria?

prokaryotes

9

What is the formula for magnification?

image size/real size

10

Does a bacterial cell have a nucleus?

no

11

What is a plasmid?

a circular strand of DNA that floats freely in the cytoplasm

12

Do bacteria have mitochondria or chloroplasts?

no

13

What are chloroplasts?

where photosynthesis occurs. they make the food for the plant

14

What is cell differentiation?

a process where cells become specialised

15

What are sperm cells specialised for?

reproduction- streamlined head and ling tail

16

What are nerve cells specialised for?

rapid signalling- long and have branched connections

17

What are muscle cells specialised for?

contraction- long so they have space to contract

18

What are root hair cells specialised for?

absorbing water and minerals- big surface area

19

What are phloem and xylem cells specialised for?

transporting substances-long and hollow

20

What do chromosomes do?

contain genetic information

21

Why do we have 23 pairs of chromosomes?

Because we have one from the father and one from the mother

22

What is the function of the cell cycle?

make new cells for growth, development and repair

23

What is mitosis?

the stage in the cell cycle where the cell divides

24

How many stages are there in the cell cycle?

2

25

What happens in the growth and DNA replication stage?

cell grows and duplicates its DNAincreases sub cellular structures like mitochondria and ribosommes

26

What are the stages of Mitosis?

chromosones line upcell fibres pull them apart membarnes form about each set of chromosonescytoplasm and membrane divide

27

How do prokaryotic cells divide?

By binary fission

28

What occurs in binary fission?

plasmids replicatestrands move to opposite polescytoplasm begins to divide2 daughter cells are produced

29

A bacterial cell has a mean division time of 30 mins. how many times will it divide in 3 hours?

3 x 60= 180180/30=6 times

30

What temperature do we culture microorganisms at?

25 degrees