DNA

Question 1

what does the nucleus contain?

Answer 1

genetic material in the form of chromosomes

Question 2

what are chromosomes?

Answer 2

coiled up DNA molecules

Question 3

what dooes chromosomes carry?

Answer 3

larfe number of genes,
-different genes control development of different characteristics e.h hair colour

Question 4

what are body cells made up from?

Answer 4

2 copies of female and male chromosomes

Question 5

hoow many chromosimes make up a human?

Answer 5

23 pairs = 46

Question 6

when cells divide what is the name of this process?

Answer 6

mitosis

Question 7

what do multicellar organisms use mitosis for?

Answer 7

grow or replace damaged cells

Question 8

how does a cell grow and replicats DNA before mitosis?

Answer 8

-DNA spreads out into LONG STRINGS
-before it divides cell grows to increas amount of SUBCELLULAR STRUCTURES e.g mitochondria
-then DNA duplicates forms 2 seperate arms = X chromosomes

Question 9

explain the process of mitosis?

Answer 9

-2 arms get pulled apart to opposite ends/poles
-membranes form around each set of chromosomes
-(becomes new nuclei)
=lastly cytoplasm & cell mebranes divides
==== produced 2 idenctical duaghter cells
(same DNA)
-

Question 10

whats binary fisson?

Answer 10

-circulare DNA & PLASMIDS replicate
-cells gets bigger
-circular DNA strands move to opposite poles
-cytoplasm begins to divide - new cell walls form
-cytoplasm divids = 2 new daughter cells produced

Question 11

from binary fission what does each daughter cell contain?

Answer 11

-one copy of circular DNA & various number of plasmids

Question 12

how do prokaryotic cells replicate/divide?

Answer 12

binary fission

Question 13

how often do bacteria cells divide?

Answer 13

mean time is 30 mins

Question 14

how can u cacualate mean amount of diviosons?

Answer 14

-time / mean divioson time
-2 ^n of step 1