Test 2

Question 1

magnification and resolution of light microscope?

Answer 1

magnification = x1500 resolution = 200nm

Question 2

magnification and resolution of Transmission electron microscope?

Answer 2

magnification = ×500k resolution =0.2nm

Question 3

magnification and resolution of scanning electron microscope?

Answer 3

magnification =×100k resolution =0.2nm

Question 4

what bonds monosaccharides together?

Answer 4

glycosidic bonds

Question 5

describe the structure of bacteria?(features)

Answer 5

circular dna, ribosomes, cell wall

Question 6

What is true about the nature of genetic code?

Answer 6

its a degenerate code(more than one code per each amino acid) its overlapping, its universal

Question 7

whats found in both prokaryotes and eukaryotes?

Answer 7

ribosomes

Question 8

what is pressure like in the mammalian system? blood in aorta, tissue fluid, lymph(colourless fluid containing white blood cells), blood in vena cava?

Answer 8

high in aorta , low in tissue fluid, low in lymph, low in vena cava

Question 9

suggest why a light microscope isnt that effective?

Answer 9

wavelenght of light is too long sample will be too small to distinguish detail even after magnification.

Question 10

advantages of staining in microscopy?

Answer 10

easier to see in more detail, it increases the contrast, able to recognise organelles

Question 11

similarities between triglyceride and phospholipid?

Answer 11

insoluble in water, contains glycerol, contain ester bonds, important in membrane structure, contain fatty acids

Question 12

difference between triglyceride and phospholipid?

Answer 12

trigylceride contains only carbon, hydrogen and oxygen

Question 13

similarities between triglyceride and cholesterol?

Answer 13

contains only carbon, hydrogen and oxygen, insoluble in water, contains fatty acids

Question 14

two features of a plant cell not in an animal cell?

Answer 14

chloroplasts, permenant vacuole

Question 15

one structure in animal cell that isnt in plant cell?

Answer 15

centriole

Question 16

differences between amylose and cellulose?

Answer 16

amy lose = coiled, monomers all the way up cellulose = b- glucose, hydrogen bonds between adjacent molecules

Question 17

difference between globular and fibrous proteins?

Answer 17

globular - circular , hydrophobic groups on the inside, hydrophillic on the outside. soluble, forms hydrogen bonds with water. fibrous - long chains, chitin forms hydrogen bonds with adjacent molecules, insoluble, strong, structural role

Question 18

how two polynucleotide chains are held together?

Answer 18

A and T join via 2 hydrogen bonds, C and G join via 3 hydrogen bonds, a phosphate group from one nucleotide contains a phosohodiester bond with carbon 3 from the pentose molecule.