biology topic 1 - 4

Question 1

What is a eukaroyotic cells?

Answer 1

Are organisms that are made up of eukaryotic cells.

Question 2

what is a prokarotic cell?

Answer 2

its a single cell organisims.

Question 3

what is the nucleus?

Answer 3

contains genetic material that controls the activity of the cell

Question 4

what is the cytoplasm?

Answer 4

A gel like substance where most chemical reactions happen.

Question 5

what is the cell membrane?

Answer 5

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

Question 6

what is the mitochondria ?

Answer 6

these are where most of the reactions for aerobic resperation takes place.

Question 7

what are ribosmes?

Answer 7

these are where proteins are made in the cell

Question 8

what is the rigid cell wall

Answer 8

its made of cellulose. it supports the cell and strengthens it.

Question 9

what is the permant vacuole?

Answer 9

contains cell sap, a weak solution of sugar and salts.

Question 10

what is chlorplast

Answer 10

these are where photsythesis ocurrs which makes food for the plant.

Question 11

give two advantages of using eletron microscopes?

Answer 11

they have a much higher reslotion and a higher magnification.

Question 12

what is the eqation for magnification?

Answer 12

image/ real size

Question 13

what is differenation?

Answer 13

is the process by which a cell changes to become a specilised for its job.

Question 14

what are sperm cells good for?

Answer 14

reproduction

Question 15

what are nerves good for?

Answer 15

rapid signalling.

Question 16

what are muscles cells good for?

Answer 16

contraction- makes it quickly contract.

Question 17

what are root hair cells good for?

Answer 17

absorbing water and minerals

Question 18

what is the phloem and xylem good for?

Answer 18

transporting substances.

Question 19

how many chromosmes does a human have?

Answer 19

23 pairs

Question 20

what is a chromosmes.

Answer 20

are colied up lenghts of DNA molescules

Question 21

what does a chromosome carry

Answer 21

each one carries a large number of genes.

Question 22

what is binary fission?

Answer 22

reproducing prokaryotic cells using a simple cell divsion.

Question 23

how many stages are there in binar fission.

Answer 23

4

Question 24

what are the steps to binary fission.

Answer 24

1) The circular DNA and plasmids repilcate.
2) The cells gets bigger and the circular DNA strands move to opposites ends of the cell
3) The cytoplasm begins to divide and new cel walls begin to form.
4) the cytoplasm divides and two daughter cells are made.

Question 25

what does bacteria need t grow with?

Answer 25

carbohdrates, minerlas, proteins, and vitamins they need to grow