from save my exams

Question 1

enzyme used in dna

Answer 1

dna polymerase
used to form new complementary base strand in condension reaction

Question 2

ribosomes

Answer 2

made of protines and ribosomal dna and found in prokaryotes and eukayotoes

Question 3

in prokayyotes transcriptiona and translation can happen spontanouslt which is because

Answer 3

there is no nucleus

Question 4

rough er has

Answer 4

ribosomes on surface

Question 5

ringed seal

Answer 5

water:
boyant in water due to low density blubber
viscosity- streamline shape, reduces water drag
thermal conductivity- insulating blubber to reduce ºc lost

air:
specific heat capacity- survive in lairs which insulate by trapped air

Question 6

latent heat of

Answer 6

fusion and vaporisation

Question 7

black throated loon

Answer 7

water:
viscosity- hydrodynamic
thermal conductivity- oiled eteiror fethers to exclure water,

air
boyancy- big wings to generate lift in air
viscosity- aerodynamic which reduces drag
thermal conductivity- insulated air trapped in down feathers

Question 8

why do h bonds happen in water

Answer 8

because of the polarity of covalent bonds there is unequal sharing of the electrons, so h bonds occure between water molecules.

Question 9

cohesion exmples

Answer 9

water sticking together on lake giving high surface tensionb for animals
going up with a transpiration pull in xylem, forming a chain by water tension

Question 10

adhesion examples

Answer 10

capillary action in soil and cellulose in plant call wal and

Question 11

the role of complementary base pairing alows

Answer 11

genetic info to be replicated and expressed

Question 12

purines (a g)
bond to

Answer 12

pyridines c t

Question 13

chargaff made the point that

Answer 13

there were 4 repeating sequences in dna

Question 14

there is fossil

Answer 14

evidence on seafloor hydrothemral vents which shows evcidence of conserved sequences from genome analysis

Question 15

prokaryotic cell has

Answer 15

cell wall, plasma membrane, cytoplasm, naked DNA in a loop and 70S ribosomes.

Question 16

eukaryote cells features

Answer 16

a plasma membrane
cytoplasm
80S ribosomes;
a nucleus with chromosomes made of DNA bound to
histones, contained in a double membrane with pores;
membrane-bound cytoplasmic organelles
including mitochondria, endoplasmic reticulum,
Golgi apparatus and a variety of vesicles or vacuoles
including lysosomes; and a cytoskeleton of microtubules and microfilaments.

Question 17

diffrences in eukaryoticc cells

Answer 17

size vaccuoles, having/size cell walls,, cilia, flagella, chloroplast, mitochondria

Question 18

fungal hyphae,

Answer 18

has many nucleus in common cytoplams

Question 19

eukaryotes all came from one common asnestor and reproduced

Answer 19

SEXUALLY

Question 20

theories come from

Answer 20

observations, theories, ideas, researchc from many people

Question 21

diffrentiation is diffrent

Answer 21

patterns of gene expresion triggered from enviro changes

Question 22

multicellularity allows

Answer 22

larger size and cell specilisation

Question 23

water electrons are

Answer 23

not shared evenly, resulting in charged