Created by Koulini Yamijala
over 3 years ago
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Question | Answer |
chromosomes | chromosome are highly coiled and condensed chromatin fibres. |
chromosome was first studied by | walther flaming |
chromatin fibres consists of | dna & histones |
building block of genetic material | Dna |
what is dna composed of | Dna is composed of 2 complementary strands wound around each other in a double helix |
What are strands made up of? | The strands are made up of deoxyribose sugar (pentose sugar) and phosphate group |
How are the 2 strands linked | nitrogenous base pair |
what are the types of nitrogenous base pairs | adenine guanine thymine cytosine |
what are the pairings between the types of nitrogenous bases | 1) Adenine and Thymine only pair with each other with 2 hydrogen bonds 2) Guanine and Cytosine only pair with each other with 3 hydrogen bond |
Repeating Dna molecule | Nucleotide base pair |
Repeating Dna molecule in a strand | Nucleotide |
what are histones | Histones are the proteins that helps in coiling and packaging of DNA structure into structural units called nucleosome. |
what happens when a dna is coiled | forms chromatin |
what happens when the chromatin highly condenses | forms chromosome but only during cell division |
Location of centromere | It is a region where the chromosomal arms are attached. |
Function of centromere | It helps in the attaching chromosome to the spindle fibre during cell division |
Define genes | genes are specific squences of nucleotide on a chromosome , that encodes some particular proteins which express in the form of some paricular feature of the body. |
Function of genes | these are the heridity units whcih are transformed from parent to off springs. |
what are the needs for new cell | 1) growth 2) reproduction 3)repair 4)replacement |
What is Dna | Dna is the polymer of nucleotide base pairs. |
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