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Transition Work Studf > Practical Science key Terms > Flashcards

Practical Science key Terms Flashcards

1
Q

When is a measurement valid?

A

When it measures what it is supposed to be measuring

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2
Q

When is a result accurate?

A

When it is close to the true value?

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3
Q

What are precise results?

A

When repeat measurements are consistent /agree closely with each other

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4
Q

What is repeatability?

A

How precise repeated measurements are when they are taken by the same person,using the same equipment,under the same conditions

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5
Q

What is reproducibility?

A

How precise repeated measurements are when they are taken by different people,using different equipment

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6
Q

What is the uncertainty of a measurement?

A

The interval within which the true value is expected to lie

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7
Q

Define measurement error

A

The difference between a measured value and true value

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8
Q

What type of error is caused by results varying around the true value in an unpredictable way?

A

Random error

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9
Q

What is a systematic error?

A

A consistent difference between the measured values and true values

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10
Q

What does zero error mean?

A

A measuring instrument gives a false reading when the true value should be zero

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11
Q

Which variable is changed or selected by the investigator ?

A

Independent variable

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12
Q

What is a dependant variable?

A

A variable that is measured every time the independent variable is changed

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13
Q

Define a fair test

A

A test in which only the independent variable is allowed to affect the dependant variable

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14
Q

What is a control variable?

A

Variable that should be kept constant to avoid them affecting the dependant variable

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15
Q

What is the formula to work out magnification

A

Size of image / actual size

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16
Q

What is the formula to work out actual size

A

Image / mag

17
Q

What is the formula to work out image size

A

Magnification x actual

18
Q

Why are feels stained before being viewed with a light microscope

A

Staining increases contrast between different cell components, makes them visible and allows the lm to be identified

19
Q

What is an eyepiece graticule ?

A

A glass disc that fits on top of the eyepiece lean that is marked with a fine scale from 1 to 100

20
Q

What is a stage micrometer?

A

A microscope slide with a very accurate scale in micro meters engraved on it

21
Q

What is a scientific drawing?

A

A labelled line drawing that is used to highlight particular features and does not include unnecessary detail or shading, it should always have a title and state the magnification

22
Q

What is magnification?

A

How many times larger and image is than than the actual size of the object being viewed

23
Q

What is resolution?

A

The ability to see individual objects as separate entities

24
Q

What is the function of the nucleus?

A

Controls the metabolic activities of the cell

Contains genetic information in form of the DNA

25
Q

What is the nucleolus?

A

Area within the nucleus of my hat is responsible for producing ribosomes

26
Q

What is the function of mitochondria?

A

Site of production of ATP in the final stages of cellular respiration
Releases energy

27
Q

What are vesicles ?

A

Membranous sacs that are used to transport materials in the cell

28
Q

What are lysosomes?

A

Specialised forms of vesicles with hydro lyric enzymes that break down waste material in cells

29
Q

What is the role of the cytoskeleton?

A

Controls cell movement
Movement of organelles within the cell
Provides mechanical strength to the cell

30
Q

Name three types of cytoskeletal filaments?

A

Microfilaments microtubules intermediate fibres

31
Q

Give two types of extension that protrude from some cells

A

Flagella and cilia

32
Q

What is the endoplasmic reticulum ? (ER)

A

A network of meme ranges enclosing flattened sacs called Cisternae

33
Q

what are the functions of the two types of ER?

A

Smooth ER lipid and carbohydrate synthesis and storage

Rough ER - synthesis and transport of proteins

34
Q

What is the function of the goofy apparatus?

A

What lays a part in modifying proteins and packaging them into vesicles

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