cells paper 1

Question 1

function of nucleus
what does it contain

Answer 1

contains genetic material

controls the activity of cell

Question 2

mitochondria

Answer 2

aerobic respiration takes place

Question 3

cytoplasm

Answer 3

gel-like substance where most of the chemical reactions happen

Question 4

cell membrane

Answer 4

hold together cell

controls what goes in and out of a cell

Question 5

ribosomes

Answer 5

protein synthesis

Question 6

what is the plant cell wall made up of

Answer 6

cellulose

Question 7

what does the permanent vacuole contain

Answer 7

cell sap

Question 8

chloroplasts

Answer 8

where photosynthesis occurs

contain chlorophyll

Question 9

differences between bacteria and plant cells

Answer 9

bacteria have both a cell membrane and a cell wall

plants have a membrane-bound nucleus while bacteria cells have a single circular strand of DNA

Question 10

plasmids

Answer 10

small rings of DNA

Question 11

Magnification formular

Answer 11

I=A x M (image size=actual size x magnification)

Question 12

what is differentiation

Answer 12

process by which a cell changes to become specialised for its job

Question 13

undifferentiated cells are called

Answer 13

stem cells

Question 14

sperm cells are specialized for?

Answer 14

reproduction

Question 15

features of a sperm cell

Answer 15

streamlined head and long tail to help swim to the egg

lots of mitochondria to provide the energy needed

Question 16

the function of nerve cells

Answer 16

carry electrical signals from one part of the body to another

Question 17

features of a nerve cell

Answer 17

cells are long to cover more distance

branched connections at their ends to connect to other nerve cells (this is to form a network around the body)

Question 18

specialisation of muscle cells

Answer 18

the function of the muscle cell is to contract quickly

cells are long (so they have space to contract)

contain lots of mitochondria

Question 19

3 main causes of variation

Answer 19

alleles
enviromental factors
genetic factos

Question 20

(c) Name the cells in a leaf that control the rate of water loss.

Answer 20

guard cells

Question 21

Which scientific term describes this movement of water?

Answer 21

transpiration stream