lesson1- cell structure

Question 1

why are cells a basic unit of life

Answer 1

because nothing smaller than a cell can lead on an independent life and show all the characteristics of a living things

Question 2

nucleas - description

Answer 2

large centrally located with a double membrane

Question 3

nucleus function

Answer 3

contains genetic information and controls all cellular activities

Question 4

cytoplasm description

Answer 4

materials surrounding the nucleus of the cell

Question 5

cytoplasm function

Answer 5

site of chemicals reaction within a cell

Question 6

cell membrane description

Answer 6

thin layer surrounding the cytoplasm and is selectively permeable

Question 7

cell membrane function

Answer 7

controls the passage of substances in and out of the cell

Question 8

cell wall description

Answer 8

outer layer made of basket like mesh of fibers made of cellulose

Question 9

vacuole description

Answer 9

fluid filled sac like structure in the cytoplasm

Question 10

vacuole function

Answer 10

stores water and solutes as cell sap and regulates water content by osmosis

Question 11

chloroplast description

Answer 11

one of many discuss shapped structures containing green chlorophyll

Question 12

chloroplast function

Answer 12

site of the photosythensis

Question 13

why is a microscope needed to study cells

Answer 13

cells are not visible to the naked eye so we need microscopes to magnify the image

Question 14

what is the cell wall made in a plant cell and is it the same or different material in fungal and bacterial cell

Answer 14

The plant cell wall is made of cellulose fibers but of different materials in fungal and bacterial cells

Question 15

if an eyepiece lens has a magnification of x10 and an objective lens x4 what is the highest magnification possible for this microscope

Answer 15

x40

Question 16

if an eyepiece lens has a magnification of x10 and an objective lens x10 what is the highest magnification possible for this microscope

Answer 16

x100

Question 17

what is a cellulose

Answer 17

Cellulose is a large carbohydrate molecule made up of thousands of glucose molecules aranged in lon strands

Question 18

how is the cell wall ideal to resist the uptake of water to maintain the shape of and support the cell

Answer 18

it is strong rigid yet slightly elastic

Question 19

are fungal and bacterial cells made of cellulose

Answer 19

no

Question 20

what are organelles, and where are they found in cells

Answer 20

Organelles are tiny structures that are present in the cytoplasm as discrete units surrounded by the membrane. they are responsible for a specialized function within the cell

Question 21

name 3 organelles found in cells

Answer 21

mitochondria, ribosonnes , chloroplast