Biology - B1 Cell Level Systems

studied byStudied by 2 people
5.0(1)
Get a hint
Hint

Describe how light microscopes and staining can be used to view cells

1 / 19

flashcard set

Earn XP

Description and Tags

20 Terms

1

Describe how light microscopes and staining can be used to view cells

A light microscope can be used to view cells as they have a slide supported by a stage which is used to place the specimen on, a stain is then put on the specimen to view colourless specimens or to highlight different structures and then the specimen is covered by a cover slip. A lamp is also used to make the image more easier to see. To then view he image you look through an eyepiece lens and adjust the objective lens to magnify the image.

New cards
2
<p>Label this diagram of a microscope</p>

Label this diagram of a microscope

knowt flashcard image
New cards
3

What is the equation for magnification?

Image Size = Actual Size x Magnification

<p>Image Size = Actual Size x Magnification</p>
New cards
4

Explain how electron microscopy has increased our understanding of sub-cellular structures

Electron microscope use a beam of electrons instead of beams or rays of light. Because electrons have a much shorter wavelength than visible light, this allows electron microscopes to produce higher resolution microscopes than light microscopes.

New cards
5

What is a Transmission Electron Microscope (TEM) used for?

It is used to examine thin slices of or sections of cells or tissues.

New cards
6

What is a Scanning Electron Microscope (SEM) used for?

An SEM has a large depth of field (distance between the nearest and farthest objects in focus) so can be used to examine the surface structure of specimens.

New cards
7
<p>What are the differences between a light microscope vs an electron microscope?</p>

What are the differences between a light microscope vs an electron microscope?

knowt flashcard image
New cards
8

How would you prepare onion cells to view under a microscope?

  1. Take a piece of onion and peel off a very thin layer

  2. Place the thin layer on a slide

  3. Place a few drops of iodine on the slide

  4. Place a cover slip over the sample

  5. Place the cover slip on the stage of the microscope

New cards
9

What is the function of the nucleus?

Contains genetic material, including DNA and controls the cells functions.

New cards
10

What is the function of cytoplasm?

A jelly-like material that contains dissolved nutrients and salts and structures called organelles. It is where most chemical reactions take place.

New cards
11

What is the function of the cell membrane?

It is permeable to some substances, but not to others so it controls what goes in and out of the cell. The cell membrane also contains receptor molecules, which receive chemical signals from outside the cell, and pass it on to the inside the cell.

New cards
12

What is the function of the mitochondria?

Organelles that contains the enzymes for respiration, and where most energy is released in respiration.

New cards
13

What is the function of a ribosome?

Where protein synthesis occurs.

New cards
14

What is the function of a chloroplast?

Organelle that contains the green pigment, chlorophyll, which absorbs the light for photosynthesis and contains the enzymes needed for photosynthesis to occur.

New cards
15

What is the function of a cell wall?

Plant and bacterial cells walls provide structure for the cell and hold it together.

New cards
16

What is a permanent vacuole?

A place in the cytoplasm filled with cell sap to keep the cell swollen.

New cards
17

Where is genetic information found in a prokaryotic cell?

  1. Chromosomal DNA - The DNA of bacterial cells is found loose in the cytoplasm. It is not contained within a nucleus.

  2. Plasmid DNA - Bacteria also have small, closed circles of DNA called plasmids that are present in their cytoplasm. Unlike the chromosomal DNA, plasmids can move from one bacterium to another providing variation.

New cards
18

What is a flagella?

A tail-like structure on cells that can rotate or move in a whip-like motion to allow the cell to move.

New cards
19

What is are these made out of,:
1. Bacteria cell wall
2. Plant cell wall

  1. Bacteria cell walls are made from peptidoglycan (bacteria) or pseudopeptidoglycan (archaea)

  2. Plant cell walls are made up of cellulose

New cards
20

Compare Eukaryotic and Prokaryotic Cells

knowt flashcard image
New cards

Explore top notes

note Note
studied byStudied by 1 person
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 12 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 28 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 460 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 49 people
Updated ... ago
4.0 Stars(3)
note Note
studied byStudied by 15 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 63 people
Updated ... ago
5.0 Stars(1)

Explore top flashcards

flashcards Flashcard78 terms
studied byStudied by 47 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard28 terms
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard34 terms
studied byStudied by 15 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard28 terms
studied byStudied by 2 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard22 terms
studied byStudied by 1 person
Updated ... ago
5.0 Stars(1)
flashcards Flashcard38 terms
studied byStudied by 1 person
Updated ... ago
5.0 Stars(1)
flashcards Flashcard92 terms
studied byStudied by 2 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard30 terms
studied byStudied by 31 people
Updated ... ago
5.0 Stars(1)