What is a chromosome - ANSWERSA coiled up piece of DNA molecules
What is diploid - ANSWERSA cell that contains its full genetic information
What is haploid - ANSWERSA cell that only contains half its genetic information
Why do cells multiply - ANSWERSFor growth and repair
Uses of mitosi...
What is a chromosome - ANSWERSA coiled up piece of DNA molecules
What is diploid - ANSWERSA cell that contains its full genetic information
What is haploid - ANSWERSA cell that only contains half its genetic information
Why do cells multiply - ANSWERSFor growth and repair
Uses of mitosis - ANSWERSMulticellular organisms use mitosis to grow
Some organisms use it to reproduce during asexual reproduction for example
strawberries
Cycle of mitosis - ANSWERSinterphase, prophase, metaphase, anaphase, telophase
What does mitosis produce - ANSWERSTwo identical daughter cells
What does growth include - ANSWERSCell differentiation
Cell division
Elongation (plants)
Cell differentiation - ANSWERSCell changes to become specialised
Cell elongation - ANSWERSWhere a plant cell expands for growth
What is cancer - ANSWERSUncontrolled cell division of abnormal cells
percentile charts - ANSWERSgrowth charts are used to assess a child's growth in
comparison to the populations average
if they are in the 75th percentile then 75% of children at that age are lighter on equal to
that i.e height and 25% where taller
, what is a stem cell - ANSWERSundifferentiated cells
they are found in early human embryos and certain places like bone marrow
embryonic stem cell - ANSWERSthese are found in early human embryos and have the
potential to divide and produce any kind of cell. therefor every type of human cell comes
from an embryonic cell originally
adult stem cells - ANSWERSthese are found in limited areas for example the bone
marrow
it is less versatile tan embryos because they are limited to producing only certain types
of cells. in animals adult stem cells are sued to replace damaged cells.
adult stem cells do not reproduce frequently and that is why in injury for example the
spine the person often needs a transplant of stem cells
meristems - ANSWERSthey contain plant stem cells
they are the only cells in a plant that divide by mitosis
they are found in the plant tissue
they produce unspecialised cells that act like embryonic stem cells that can produce any
kind of cell. unlike in humans these stem cells will continue to do this until the plant dies
stem cells used in medicine - ANSWERSadult stem cells can be used to cure some
diseases e.g. sickle cell disease can be cured with a bone marrow transplant which
contains adult stem cells that will produce new blood cells.
scientists have experimented with extracting stem cells from early embryos and growing
them in controlled conditions to produce specialised cells which may be possible to use
this to replace damaged cells after and injury or disease
what are the risks with using lab grown specialised cells from stem cells in medicine -
ANSWERStumour growth because stem cells divide quickly
disease transmission because viruses live inside cells
rejection if the body recognises the cells are alien then it my reject them
What makes up the central nervous system? - ANSWERSbrain and spinal cord
spinal cord - ANSWERSit is a long colom of neurons that run from the base of the brain
down the spine. in several parts of the spinal chord neurons branch of into other parts of
the body
the spinal chord relays information between the body and the brain
the brain - ANSWERSit is made up of billions of connected neurons
cerebrum - ANSWERSthe largest part of the brain
divided into two hemispheres called cerebral hemispheres
right side controls muscle movement in the body on the left and vise versa
different parts of the cerebrum are responsible for :
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