問題一覧
1
what is continuous variation?
charaestics that can be measure and can be a range of values
2
discontinuous variation
charaestics that can be one of a limited number of options
3
what is the structure of dna called
double helix
4
(around) how many genes do human have
20,000
5
what are genes reponsible for
the characteristics that are inherited from your parents
6
how much chromosomes does a human have in each cell
46
7
how many chromosomes is in your sex cells
23
8
if a person has a extra chromosome what disability do they have
down syndrome
9
one copy of all your chromosomes is called your….
mono
10
dna is wrapped up into chromosomes which are found in the….
nucleus
11
what do white blood cells produce
antibodies
12
what do the antibodies (produced by the white blood cells) destroy
pathogens
13
white blood cells also produce antitoxins which destroy
toxins
14
what does the phagocytosis do..
engulf and digest the pathogen
15
“_____ _______ remember the antigens on the pathogen and recognise them again to produce antibodies” what is the name of this process
memory lymphocytes
16
our white blood cells ______ the pathogen and digest it
surround
17
antibodies are given to the body and will run out when used up a person would get this if their bodies aren’t producing enough antibodies. what immunity is this?
passive immunity
18
your body is working to produce antibiotics
active immunity
19
example of active immunity that is artificial
vaccination~fast acting
20
an example passive immunity artificial
anti-venom
21
active immunity natural
antibodies produced after infection
22
an example of passive immunity natural
antibodies passed through mother to baby
23
“can be achieved if you give everyone the vaccine rather that just 1 person/animal” what is this immunity called?
herd immunity
24
what are antibiotics used to kill?
bacteria
25
inside the cell you have the _____ then the chromosome then ____ the genes. (write your answer as ____ and ______)
nucleus and dna
26
how does antibiotic resistance occur
when your sick and you dont finish your antibiotic to fully kill the bacteria then since you didnt fully Kill the bacteria it comes back but the antibiotic won’t work because your body used to it so its being resistant and its not Killing the bacteria
27
charles darwin’s theory of the natural selection
survival of the fittest
28
what does evolution mean
when species change over time
29
what does the nose have to protect bacteria getting in
cilla
30
the skin has ___ to stop bacteria getting in
sebum
31
the stomach has ___ to stop bacteria from getting in
acids
32
the trachea has ____ to stop bacteria from getting in
silla
33
photosynthesis equation
carbon dioxide + water -> sunlight-> glucose +oxygen
34
what 2 things do the chloroplasts absorb
energy and sunlight
35
why is the end root normally covered in tiny root hair cells?
to absorb water
36
purpose of the small holes on the underside of the leaves
to absorb carbon dioxide
37
wax cuticle is to
keep water escaping
38
guard cell of a plant..
opens at daylight
39
airspace in plants allows what?
carbon dioxide to move through
40
how does the plant use the glucose made in photosynthesis (give 2 answers)
helps growth gives energy
41
why does the plant covert the glucose it makes in photosythsis into starch?
42
4 things that help photosynthesis?
light carbon dioxide tempature water availability
43
photosynthesis is a _________ reaction.
endothermic
44
why when testing for starch in a leaf do we place the leaf in boiling water
to kill it
45
why do we place leaf in boiling ethanol
46
vaccines causes your body to produce more antibodies in reponse to the ______ pressent in the vaccine
antigens
47
vaccines contain ___ or _____ versions of the pathogens
dead or modified
48
when skin is cut the blood ____ to prevent bacteria entering the body
cluts
49
antibodies stick to the _____ of the bateria
antigens