DNA Importance I Crossword Puzzle

QUESTIONS LIST:

• replicating: dna is the only known chemical that is capable of _ itself.
• directions: dna contains these, which guide repair and construction of cell parts.
• genes: dna contains about 100,000 of these in 46 chromosomes in each human body cell.
• continuity of life: dna self-replication ensures this.
• mutations: these are alterations in the dna in a chromosome.
• structure: the key to understanding the function of something comes from knowing this about it.
• protein: chromosomes are 50% nucleic acid and 50% this.
• amino acids: by changing the sequence of only one of these in a protein chain, a different protein is formed.
• nucleic acid: this is a type of a large organic molecule that is the general term for both dna and rna.
• nucleotides: this is the basic building block of nucleic acids.
• backbone: phosphate and a ribose sugar makes up the backbone of a nucleotide.
• nitrogenous: there are four of these bases in nucleic acids: adenine, cytosine, guanine, and thymine.
• adenine: this nitrogenous base binds only with thymine and uracil.
• cytosine: this nitrogenous base binds only with guanine.