B1 cells Flashcards
topics that haven’t come up yet
if the magnification of an eyepiece is x10 and the objective is x40 what is the magnification of the microscope
x400
what is one millimetre in standard form
1 × 10^-3 m
what is one micrometer in standard form
1 × 10-6 m
what is one nanometre un standard
1 × 10-9 m
how is standard form written Ax10^n
A is bigger then one but less then 10
what would 0.000007 or 7μm be in standard form
7x10^-6
what’s the symbol for micrometer
μm
what is 1mm in micrometers
1000 μm
define the term magnification
The amount that an image of something is scaled up when viewed through a microscope.
define resolution
how is genetic information stored in the nucleus of a cell
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
.
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.
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
describe the use of stem cells in production of plant clones
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.
why is plant cloning effective
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.
how does plant cloning occur naturally
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
what is therapeutic cloning
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.
why use stem cell transplants instead of a donor
-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.
-
