Genes/DNA

Which of the following are components of nucleotides? (a) deoxyribose (b) amino acids (c) phosphate (d) enzymes (e) nitrogenous bases

Which of the following represent a correct pairing of bases? (a) adenine with thymine (b) adenine with guanine (c) thymine with adenine (d) guanine with cytosine (e) thymine with thymine

The building blocks of DNA are:

Which of the following are nitrogenous bases? (a) Valine (b) Guanine (c) Thymine (d) Serine

Replication of DNA occurs (a) During cell division (b) before cell division (c) at any time

A nucleotide triplet codes for (a) a protein (b) an amino acid (c) an enzyme (d) an organic base

The sequence of bases in DNA forms the

A group of three bases (_________) controls the production of a particular amino acid in the cytoplasm of the cell

Such a sequence forms a

There may be a _________ or more bases in one gene

Cytosine Adenine Thymine=

Cytosine Guanine Adenine=

Each triplet codes for a specific _______

The sub-units are called

Each nucleotide is made up of a sugar called

is a sugar, like glucose, but with only five carbon atoms in its molecule

is almost the same but lacks one oxygen atom

Both molecules may be represented by the symbol

The most common bases are

The deoxyribose, phosphate and one of the bases Combine to form a

When does DNA strands unwind and separate

Each strand makes a new partner by adding the appropriate

The result is that there are now ________ DNA molecules in the nucleus

Before a cell divides, the DNA strands unwind and separate Each strand makes a new partner by adding the appropriate nucleotides The result is that there are now two double-stranded DNA molecules in the nucleus So that when the cell divides, each nucleus contains identical DNA This process is called