random Flashcards

1
Q

which part of the blood helps it to clot if the skin is cut

A

platelets

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2
Q

your stomach contains which type of acid

A

hydrochloridric

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3
Q

how are infectious diseases transmitted

A

air particles
contaminated food and water
surfaces

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4
Q

which one of these is not likely to be a pathogen

A

mosquito

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5
Q

which of these would not be a feature of a good vaccine

A

unlikely to produce her immunity

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6
Q

antibodies have to be _______to kill pathogens

A

specific

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7
Q

why is the term used to describe you not being able to become ill with a particular pathogen

A

immune

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8
Q

any foreign molecule that is recognise by and able to elicit a specific response from a lymph is called an…

A

antigen

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9
Q

any foreign molecule that is recognise by and able to elicit a specific response from a lymph is called an…

A

antigen

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10
Q

A Y shaped protein molecule which recognises specific foreign antigens

A

antibody

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11
Q

how does a vaccination work

A

infection someone with weakened or inactive pathogens

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12
Q

primary response

A

when a person becomes infected with the disease for the first time and responds by producing antibodies

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13
Q

do antibiotics work on viruses

A

true

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14
Q

what is a “chromosome”

A

line strand of DNA coiled up into a structure

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15
Q

what shape is dna

A

double helix

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16
Q

how many chromosome does a human cell usually contain

17
Q

dna is found within all the cells of humans except

A

red blood cells

18
Q

there are two parents and genetic information is passed on from both of these to the offspring

A

sexual reproduction

19
Q

how many daughter cells are formed during mitosis

A

2 identical

20
Q

mitosis is important for

A

growth, repair and asexual reproduction

21
Q

during which phase of mitosis does dna replicate

A

interphase

22
Q

uncontrollable or runaway cell division results in

23
Q

which phase of mitosis do the chromosomes condense and become visible

24
Q

during cytokines the cell

A

divides into two daughter cells

25
order of mitosis is
interphase prophase metaphase anaphase telophase + cytokinesis
26
mitosis results in
four haploid daughter cells
27
evolution
gradual changing of a species over the time
28
which individuals are most likely to survive to reproduce
those that are well suited to their environment
29
what is adaptation
a feature of an organism that allows it to survive in its environment
30
why are fossils used to prove evolution happened
they provide evidence of different species for a long time ago
31
what is genetic mutation
a random change in organisms dna
32
why is survival of the fittest associated with natural selection
within a population individuals who have a selective advantage will survive while others dies out
33
some genes give characteristics that mean an organism is ———- suited to living in an environment
better r
34
genetic variation is controlled by
the genes inherited from your parents
35
the part of an enzyme that’s the substrate interacts with is called the
active site
36
enzymes are effected by
temperature concentration ph
37
What’s a independent variable
A variable that’s is BEING CHANGED
38
Control variable
Must kept the same in order to make results affected
39
Dependant variable
Variable TESTED/MESURED during experiment