Question

question 17
match the dna key terms to their correct definition.
matchy matchy time!
column a

1. adenine
2. base pairing
3. cytosine
4. guanine
5. thymine
6. mutagen
7. frameshift mutation
8. point mutation
9. chromosomal mutation

column b
a. one of four nitrogenous bases found in dna and rna; pairs with guanine
b. mutation that shifts the
eading frame\ of the genetic message by inserting or deleting a nucleotide
c. nitrogenous base found in dna but not in rna
d. one of four nitrogenous bases found in dna and rna; pairs with cytosine
e. one of four nitrogenous bases found in dna and rna; pairs with thymine or uracil
f. gene mutation in which a single base pair in dna has been changed
g. a change in number of chromosomes or a large amount of dna in an organism
h. principle that bonds in dna can form only between adenine and thymine and between guanine and cytosine
i. chemical or physical agents in the environment that interact with dna and may cause a mutation

Explanation:

• Adenine pairs with thymine or uracil.
• Base pairing is the principle that bonds in DNA can form only between adenine and thymine and between guanine and cytosine.
• Cytosine pairs with guanine.
• Guanine pairs with cytosine.
• Thymine is a nitrogenous base found in DNA but not in RNA.
• A mutagen is a chemical or physical agent in the environment that interacts with DNA and may cause a mutation.
• A frameshift mutation is a mutation that shifts the "reading frame" of the genetic message by inserting or deleting a nucleotide.
• A point mutation is a gene mutation in which a single base pair in DNA has been changed.
• A chromosomal mutation is a change in the number of chromosomes or a large amount of DNA in an organism.

Answer:

1. e. one of four nitrogenous bases found in DNA and RNA; pairs with thymine or uracil
2. h. principle that bonds in DNA can form only between adenine and thymine and between guanine and cytosine
3. a. one of four nitrogenous bases found in DNA and RNA; pairs with guanine
4. d. one of four nitrogenous bases found in DNA and RNA; pairs with cytosine
5. c. nitrogenous base found in DNA but not in RNA
6. i. chemical or physical agents in the environment that interact with DNA and may cause a mutation
7. b. mutation that shifts the "reading frame" of the genetic message by inserting or deleting a nucleotide
8. f. gene mutation in which a single base pair in DNA has been changed
9. g. a change in number of chromosomes or a large amount of DNA in an organism