Flashcards
DNA and Chromosomes
Cards in this deck (13)
- 1What is the DNA like in prokaryotic cells, such as bacteria?-much smaller
-forms circles
-do not associate with protein molecules
-do not have chromosomes - 2What is the DNA like in eukaryotic cells?-associates with proteins
-has chromosomes
-molecules are larger and linear - 3What are the two assets of a chromosome?-two chromatids
-one centromere in the centre holding the chromosome together - 4When are chromosomes visible?When cells are dividing (prophase)
- 5How is the DNA in the chromosomes held in position?proteins
- 6How is the length of the DNA found?Highly coiled and folded.
- 7How many chromosomes do humans have?46
- 8Chromosomes occur in pairs called..homologous pairs.
- 9Homologous chromosomes are made up of..one chromatid from the mother and one from the father, it is diploid.
- 10A homologous pair is always..two chromosomes that determine the same genetic characteristics, however determining the same characteristics is not the same as being identical.
- 11What is an allele?variation of a gene
- 12What does each allele code for?It's own polypeptide
- 13What happens as a consequent of a difference in the base sequence of an allele of a single gene occurs?May result in a different sequence of amino acids being coded for, therefore different polypeptides- different primary therefore tertiary structure, substrate may not fit enzyme's active site etc.
Information
- Description
- AS Biology2 (DNA and Meiosis) Flashcards on DNA and Chromosomes, created by sammi_taylor01 on 29/05/2013.
- Created by
- sammi_taylor01
- Views
- 87
- Tags
- Rating