The main role of DNA molecules is the long-term storage of information. DNA is often compared to a set of blueprints, like a recipe or a code, since it contains the instructions needed to construct other components of cells, such as proteins and RNA molecules.
RNA molecules play an active role in cells by catalyzing biological reactions
Threadlike strands of DNA(30%)
histone proteins (60%)
and RNA (10%)
•Arranged in fundamental
units called nucleosomes
•Condense into barlike
bodies called chromosomes when the cell starts to divide
Transfers DNA gene base sequence to a complementary base sequence of an mRNA
Converts base sequence of
nucleic acids into the amino acid sequence of proteins
Involves mRNAs, tRNAs, and
list the stages of mitosis in order
What stage of mitosis does DNA synthesis take place.
Properties of Water.
High surface tension because of hydrogen bonds.
60-80% of living cells
Prevents sudden temperature change.
Disolves ionic compounds.
•Sugars and starches
•Contain C, H, and O [(CH20)n]
C, H, O (less than in carbohydrates), and sometimes P
•Insoluble in water
•Neutral fats or triglycerides
Polymers of amino acids (20 types)
Joined by peptide bonds
Contain C, H, O, N, and sometimes S and P
Lower the activation energy, increase the speed of a reaction