B1 cells Flashcards

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1
Q

if the magnification of an eyepiece is x10 and the objective is x40 what is the magnification of the microscope

A

x400

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2
Q

what is one millimetre in standard form

A

1 × 10^-3 m

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3
Q

what is one micrometer in standard form

A

1 × 10-6 m

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4
Q

what is one nanometre un standard

A

1 × 10-9 m

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5
Q

how is standard form written Ax10^n

A

A is bigger then one but less then 10

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6
Q

what would 0.000007 or 7μm be in standard form

A

7x10^-6

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7
Q

what’s the symbol for micrometer

A

μm

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8
Q

what is 1mm in micrometers

A

1000 μm

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9
Q

define the term magnification

A

The amount that an image of something is scaled up when viewed through a microscope.

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10
Q

define resolution

A
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11
Q

how is genetic information stored in the nucleus of a cell

A

DNA
exists in a cell’s nucleus within structures called
chromosomes
. Each section of a chromosome that contains the code for the production of a particular protein is called a
gene
.

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11
Q

What is the difference in order of magnitude for a human hair and HIV?
The width of a human hair is 100 μm, while the width of the HIV is 100 nm.

A

The difference in order of magnitude is 3.
Calculation:
The width of the human hair is 100 μm = 10-4 m
The width of the HIV is 100 nm = 10-7 m
So, there are three orders of magnitude difference:

Or, more simply:
4 – (-7) = -4 + 7 = 3

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11
Q

describe the use of stem cells in production of plant clones

A

Cells from meristems can be
cloned
. Meristematic cells are removed from a plant and grown in
tissue culture
. The cells are grown in a
culture medium
that contains
agar
– to provide support and water for the growing cells – along with nutrients and
plant hormones
to stimulate growth and cell division.

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12
Q

why is plant cloning effective

A

Producing new plants by cloning is quicker than allowing plants to reproduce and collecting and sowing seeds. It’s therefore an effective way of producing new individuals from rare and endangered plants, helping to preserve the species.

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12
Q

how does plant cloning occur naturally

A

Cloning in plants also occurs naturally, for instance, in
runners in strawberry plants. An older, simpler method of cloning plants that gardeners use to produce new, identical plants is by taking
cuttings

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13
Q

what is therapeutic cloning

A

Using cloning technology for medicinal purposes. One example is to use a person’s DNA to clone one of their organs for use in transplanting.

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14
Q

why use stem cell transplants instead of a donor

A

-Those that use the patient’s own stem cells would be genetically identical
Those from a donor would not be genetically identical. and would not be rejected Fewer complications would arise if the stem cells came from a close member of the family. Alternatively, donor cells could come from a person with closely-matched tissue types. by the patient’s immune system.
-

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15
Q

describe therapeutic cloning

A

Therapeutic cloning
could produce stem cells with the same genetic make-up as the patient.
The technique involves the transfer of the nucleus from a cell of the patient, to an egg cell whose nucleus
has been removed.

16
Q

evaluate benefits and risks of stem cells in medicine (give benefits)

A

Stem cells have great potential, in treating patients with currently untreatable conditions, growing organs for transplants, and research.

Therapeutic cloning
could produce stem cells with the same genetic makeup and would not be rejected by the patient’s immune system.

17
Q

list clinical issues with stem cells

A

There is no guarantee how successful these therapies will be

The current difficulty in finding suitable stem cell donors.

Cultured stem cells could be contaminated with viruses which would be transferred to a patient.

18
Q

list ethical issues of stem cells

A

A source of embryonic stem cells is unused embryos produced by in vitro fertilisation (IVF)

For At what stage of its development should an embryo be regarded as, and treated as a person? therapeutic cloning is it right to create embryos for therapy, and destroy them in the process?

19
Q

describe the digestive systems functions

A

it has two functions:
breaks down complex food substances
provides the very large surface area for maximum absorption of food

20
Q

mouths function

A

Begins the digestion of carbohydrates

21
Q

stomachs function

A

Begins the digestion of protein; small molecules such as alcohol absorbed

22
Q

function of small intestine- duodenum

A

Continues the digestion of carbohydrate and protein; begins the digestion of lipids

23
Q

small intestine- lleum

A

Completes the digestion of carbohydrates and proteins into single sugars and amino acids; absorption of single sugars, amino acids and fatty acids and glycerol

24
Q

large intestine

A

Absorption of water; egestion of undigested food

25
Q

what are digestive enzymes used for

A

Digestive
enzymes
are used to break down food in the
gut
into small,
soluble
molecules that can be absorbed through the gut wall.

26
Q

how does the digestive system work as an organ system

A

several organs work together to digest and absorb food

27
Q

what is digestion

A

a process in which relatively large, insoluble molecules in food (such as starch, proteins) are broken down into smaller, soluble molecules that can be absorbed into the bloodstream and delivered to cells in the body

28
Q

how can the products of digestion be used

A

Digested molecules can be used to construct new carbohydrates, proteins and lipids in the body. Some glucose produced by digestion is used for respiration.

29
Q

describe how patients can be treated in the case of heart failure

A

Drugs - statins to prevent build-up of material in arteries

Heart transplant to replace a damaged heart

Replacement heart valves to improve circulation of blood

30
Q

where is the pacemaker located in the heart

A

wall of the right atrium

31
Q

what is the only artery of the body to carry deoxygenated blood

A

the pulmonary artery

32
Q

what is the only vein to carry oxygenated blood

A

the pulmonary vein

33
Q

what’s the difference between arteries and veins

A

arteries carry blood away from the heart, veins towards it.

34
Q

evaluate the advantages and disadvantages of drugs to treat heart disease

A

advantages:
-reduce risk of heart attack
-used to reduce cholesterol levels that have genetic causes
-cheap to administer
-may have beneficial effects in other conditions

disadvantages:
-not suitable for people with liver disease
-some side effects
-must be taken for life
-can’t take if pregnant or breastfeeding

35
Q

evaluate the advantages and disadvantages of heart transplants

A

advantages:
improve quality of life and can be lifesaving

disadvantages
-few donor hearts are available
-recovery time is long
-risk of rejection by the body’s immune system
-expensive operation and aftercare

36
Q

evaluate the advantages and disadvantages of Replacement heart valves

A

advantages:
restore blood flow through the heart
less risk of complications in surgery then transplant

disadvantages:
-biological values may wear out
-blot clots can stick to mechanical valve
-anti blood clotting drugs need to be taken which increases risk of further illness

37
Q

what lifestyle changes can be made to prevent heart disease

A

-cut down on fatty foods- lower blood cholesterol
-stop smoking- can effect blood pressure and reduce risk of heart attack
-regular exercise
-reduce salt in diet to reduce blood pressure

38
Q

what factors to doctors need to consider before choosing treatment of heart disease

A

the likely effectiveness of the treatment
the risk of causing further harm
the costs and benefits to both the patient and the health service

39
Q

what are known risk factors for cancer

A

lifestyle factors:
viruses linked with cancer (hpv) being spread through sex
chemical carcinogens in cigarettes
alcohol intake
exposure to uv- which is ionising during sunbathing or outdoor activities-skin cancer
diet including fat and salt intake increases risk of cancer

environmental:
exposure to ionising radiation
exposure to chemical carcinogens

genetic risk:
genetic inheritance

40
Q

how are plant leaves adapted for gas exchange and photosynthesis

A

large surface area: maximum absorbtion of light for optimum absorption of carbon dioxide
air spaces between cells within the leaf

air spaces between cells within the leaf:
for the diffusion of gases