8269835
Descripción
Pregunta 1
Pregunta
Choose the statement which BEST describes a cell.
Respuesta
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The simplest collection of matter which is alive.
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One of the structures which make up a living organism.
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A little living thing.
Pregunta 2
Pregunta
Select the statements about cells that are CORRECT.
Respuesta
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All organisms are made of cells.
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Cells can make up multicellular organisms.
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All cells are identical.
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Cells come in many different types.
Pregunta 3
Pregunta
The 3 Domains of living things are:
Respuesta
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Eukarya, Bacteria, Archaea
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Eukarya, Bacteria, Prokarya
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Bacteria, Archaea, Prokarya
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Eukarya, Bacteria, Protists
Pregunta 4
Pregunta
The Kingdoms of Domain Eukarya are:
Respuesta
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Animalia, Plantae, Fungi, Protista
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Animalia, Plants, Fungi, Protists
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Animals, Plants, Fungi
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Animalia, Plantae, Fungi
Pregunta 5
Pregunta
Bacteria and Archaea are [blank_start]prokaryotes[blank_end].
Respuesta
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prokaryotic
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eukaryotic
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protists
Pregunta 6
Pregunta
Most plant and animal cells are between [blank_start]10-100μm[blank_end] in diameter. Bacteria is typically between [blank_start]1-5μm[blank_end] in diameter.
Respuesta
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10-100μm
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1-5μm
Pregunta 7
Pregunta
1mm = ?
Respuesta
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1000μm
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100μm
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10μm
Pregunta 8
Pregunta
Which statement about the endosymbiont theory is INCORRECT?
Respuesta
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Mitochondria and plastids as we know them may have evolved from aerobic cells being engulfed by larger anaerobic cells, and this is known as the endosymbiont theory.
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The endosymbiont theory is supported by the fact that mitochondria and plastids carry some of their own genes within themselves.
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The endosymbiont theory suggests that organelles with double membranes evolved from bacteria to insert into eukaryotic cells.
Pregunta 9
Pregunta
Cells are limited to their sizes due to the ratio of surface area to volume of the cell. (s.a./V = smaller for smaller cells.) A small ratio means greater efficiency of exchange between environments.
Respuesta
- True
- False
Pregunta 10
Pregunta
[blank_start]Microscopes[blank_end] allow us to see cells. There are three important parameters in microscopy:
- [blank_start]Magnification[blank_end], which is the [blank_start]ratio[blank_end] of the image compared to the actual size
- [blank_start]Resolution[blank_end], which is the [blank_start]clarity[blank_end] of the image ("resolving of two points")
- [blank_start]Contrast[blank_end], the difference between light and dark areas of image
Respuesta
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Microscopes
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Magnification
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ratio
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clarity
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Resolution
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Contrast
Pregunta 11
Pregunta
Light Microscopy (LM) and Electron Microscopy (EM) are the two types of microscopy used to look at cells.
Respuesta
- True
- False
Pregunta 12
Pregunta
Electron microscopy lets you look at live cells.
Respuesta
- True
- False
Pregunta 13
Pregunta
Light microscopy is the only imaging technique that lets you look at live cells.
Respuesta
- True
- False
Pregunta 14
Pregunta
Select the statements about electron microscopy that are CORRECT.
Respuesta
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EM uses electrons to "slice" through a very thin cross section of a cell and look at it.
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Resolution is INVERSELY proportional to wavelength. Therefore as an electron microscopes particles have very low wavelengths, the images produced have very high resolutions.
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Resolution is PROPORTIONAL to wavelength. Since an electron microscope's particles have long wavelengths of light, they therefore produce high resolution pictures.
Pregunta 15
Pregunta
Electron microscopes come in [blank_start]two[blank_end] varieties. Firstly, [blank_start]scanning electron microscopes[blank_end]. Specimens coated in a thin film of gold are scanned and [blank_start]electrons[blank_end] that bounce back are used to create a 3D image of the specimen's surface. (These images are grey scale, only show us the [blank_start]surface[blank_end] of cells, and must be artificially/digitally coloured.)
Secondly, [blank_start]transmission electron microscopy[blank_end]. This does not [blank_start]reflect[blank_end] electrons, but passes them [blank_start]through[blank_end] the specimen to produce an image of the cell's [blank_start]internal[blank_end] structure. Scattered electrons are collected by electromagnets to form an image. Again, the specimen must be stained with heavy metals.
Respuesta
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two
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scanning electron microscopes
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transmission electron microscopy
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electrons
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surface
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reflect
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through
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internal
Pregunta 16
Pregunta
Which organelles do animal cells have that plant cells DO NOT?
Respuesta
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Lysosomes
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Centrosomes
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Endoplasmic Reticulum
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Ribosomes
Pregunta 17
Pregunta
Which of the following is are structures found in plant cells but NOT in animal cells?
Respuesta
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Vacuole
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Cell Wall
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Plasmodesmata
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Golgi
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