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What are the 3 components of a nucleotide?

carbon sugar, phosphate group, nitrogenous base

What are the 3 differences between DNA and RNA?

DNA- double stranded, contains deoxyribose sugar and thymine base
RNA- single stranded, contains ribose sugar and uracil base

What are the complementary base pairs in DNA and RNA?

DNA- Adenine to Thymine, and Guanine to Cytosine
RNA Thymine to Uracil, and Cytosine to Guanine

Which two nitrogenous bases are purines? pyrimidlines?

purines: adenine and guanine
pyrimidlines: cytosine and thymine

what is a chromosome?

threadlike structure of nucleic acids and proteins for in the nucleus
carrying genetic information in the form of genes

what is a gene?

sequence of DNA that codes for a protein and determines a trait

what does each gene produce?


How many pairs of chromosomes are found in humans?

23 pairs

How many chromosomes are found in a normal body cell?

46 chromosomes

How many chromosomes are found in a sex cell?

23 chromosomes

Where do the chromosomes in each pair come from?

one from each parent

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