Test
2.1 Cell Structure
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Preguntas del test (16)
1A light microscope has 3 [blank_start]objective[blank_end] lenses, one [blank_start]eyepiece[blank_end] lens, a c[blank_start]oarse[blank_end] focusing knob and a f[blank_start]ine[blank_end] focusing knob.
- Aobjective
- Beyepiece
- Coarse
- Dine
2the max magnification of a light microscope is
- Ax 5000
- Bx 200 000 000
- Cx 1500
- Dx 150 000
3in microscopy, we call the sample the [blank_start]object[blank_end] and the what we see throught the microscope the [blank_start]image[blank_end].
- Aobject
- Bimage
4the max resolution of a light microscope is [blank_start]0.2[blank_end] micrometres
- A0.2
5during preparation, which slides require water or liquid (not including the sample)
- Adry mount
- Bwet mount
- Csquash slide
- Dsmear slide
6Stains are used to increase the [blank_start]contrast[blank_end] of a specimen to make all cell components [blank_start]visable[blank_end]
- Acontrast
- Bvisable
7preparing a wet mount slide:
use a [blank_start]pipette[blank_end] to place a drop of [blank_start]water[blank_end] onto the centre of a glass slide. cut a [blank_start]thin[blank_end] slice of a specimen and place it on the slide using [blank_start]forceps[blank_end]. Add a few drops of [blank_start]stain[blank_end] to the specimen to increase the [blank_start]contrast[blank_end] so that the cell components become visible. Slowly and carefully add the [blank_start]cover slip[blank_end] to the slide.- Apipette
- Bwater
- Cthin
- Dthick
- Eforceps
- Fyour hands
- Gstain
- Hcontrast
- Iresolution
- Jcover slip
8smear slides are good for viewing...
- Ahairs
- Bdust
- Cblood
- Dpollen
- Eroot tips
9[blank_start]stains[blank_end] are coloured chemicals which bind to the [blank_start]molecules[blank_end] in or on a [blank_start]specimen[blank_end]
- Astains
- Bmolecules
- Cspecimen
10preparing a sample to stain:
place a specimen on a slide and allow to [blank_start]air dry[blank_end]
[blank_start]heat[blank_end] fix by passing the slide through a [blank_start]flame[blank_end]
the specimen will adhere to the [blank_start]slide[blank_end] and take up the stain- Aair dry
- Bheat
- Cflame
- Dslide
11some stains are general, but some stains bind to specific cell structures. this is called:
- Aspecific staining
- Bdifferential staining
- Cstain scanning
12biological drawings SHOULD:
- Ainclude a title
- Binclude shading
- Chave clear continuous lines
- Dbe drawn in sharp pencil
- Einclude arrows for labeling
- Finclude accurate sizes of observable structures
- Ginvolve overlapping lines
- Hinclude scale or state magnification
13order of units:
millimetres, nanometres, micrometres- AVerdadero
- BFalso
14Electron microscopes have a much [blank_start]higher[blank_end] magnification than light microscopes. Their max magnification is x [blank_start]2,000,000[blank_end] (for transition EM) or x [blank_start]200, 000[blank_end] (for scanning EM) . They use electrons instead of light waves as electrons have a much [blank_start]shorter[blank_end] [blank_start]wavelength[blank_end]. This allows the electron microscope to have a much stronger [blank_start]resolution[blank_end].
- Ahigher
- Blower
- C2,000,000
- D1,500
- E20,000
- F200, 000
- G15, 000
- H100,000
- Ishorter
- Jlonger
- Kwavelength
- Lfrequency
- Mresolution
- Nmagnification
15pros of electron microscopes:
- Ahigher magnification
- Bstronger resolution
- Cscanning EM can produce 3D images
- Dcan view ultrastructure of cells
- Echeap
- Feasy to use
- Gslides are simple to prepare
- Hliving specimens
- Iartefacts may be present
16cons of electron microscopes:
- Aexpensive
- Blarge pieces of equipment
- Crequire skill and training to use and prepare specimens
- Dmetallic stains can be hazardous
- Especimens must be dead
- Fspecimens can be damaged by electron beams
- Glow magnification
- Hpoor resolution
- Iartefacts may be present
Información
- Descripción
- AS level (Module 2 Foundations in Biology) Biology Test sobre 2.1 Cell Structure, creado por reggie black el 15/09/2025.
- Autor
- reggie black
- Idioma
- English
- Visitas
- 1
- Historial
- Creado el 15 sep 2025 · actualizado el 16 nov 2025
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