AP Biology Molecular Genetics
Flashcard
•
Biology
•
9th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What molecule contains codons?
Back
mRNA (messenger RNA) contains codons, which are sequences of three nucleotides that correspond to specific amino acids.
2.
FLASHCARD QUESTION
Front
What is a nonsense mutation?
Back
A nonsense mutation is a type of mutation that results in an early stop codon, leading to a truncated protein.
3.
FLASHCARD QUESTION
Front
When are the genes in the lac operon expressed?
Back
The genes in the lac operon are expressed when lactose is present in the cell.
4.
FLASHCARD QUESTION
Front
If a DNA segment contains 22% adenine, what percentage of guanine is present?
Back
28%. According to Chargaff's rules, the percentage of guanine is equal to the percentage of cytosine, and the total percentage of adenine and thymine equals that of guanine and cytosine.
5.
FLASHCARD QUESTION
Front
What are exons?
Back
Exons are the segments of DNA that are coded for and expressed in the final mRNA product.
6.
FLASHCARD QUESTION
Front
What is the role of tRNA in protein synthesis?
Back
tRNA (transfer RNA) transports amino acids to the ribosome during protein synthesis, matching its anticodon with the codon on mRNA.
7.
FLASHCARD QUESTION
Front
What is a frameshift mutation?
Back
A frameshift mutation is a genetic mutation caused by insertions or deletions of nucleotides that shift the reading frame of the genetic message.
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