AP Biology Unit

Identify which of the following best describes purines and pyrimidines.

• Purines (C, T, & U) have single ring, Pyrimidines (A & G) have double ring

• Purines (C, T, & U) have double ring, Pyrimidines (A & G) have single ring

• Purines (A & G) have single ring, Pyrimidines (C, T, & U) have double ring

• Purines (A & G) have double ring, Pyrimidines (C, T, & U) have single ring

Which enzyme is responsible for unzipping the DNA strands?

• helicase

• DNA polymerase

• topoisomerase

• ligase

Which enzyme is responsible for joining the fragments on the lagging strand?

• helicase

• DNA polymerase

• topoisomerase

• ligase

How do the three types of RNA work together?

• mRNA carries message, tRNA carries amino acids, and rRNA makes ribosome

• mRNA makes ribosomes, tRNA carries amino acids, and rRNA relays information

• mRNA carries amino acids, tRNA transfer message, and rRNA makes ribosome

• mRNA is made, tRNA holds the DNA in place, and rRNA removes the deoxyribose

What is the flow of genetic information in cells from DNA to protein? (Central Dogma)

• RNA to DNA to protein

• DNA to RNA to protein

• protein to DNA to RNA

• RNA to protein to DNA

Tags

NGSS.HS-LS1-1

Protein molecules around which DNA is tightly coiled in chromatin

• Histones

• Whey

• Casein

• Hemoglobin

Which of the following is an example of post-transcriptional control of gene expression?

• the addition of methyl groups to cytosine bases of DNA

• the binding of transcription factors to a promoter

• the removal of introns and splicing together of exons

• gene amplification contributing to cancer

The production of mature mRNA in eukaryotes involves

• cutting introns out and spicing exons together

• adding the 5' cap

• adding the 3' poly A tail

• all of these are correct

What is the function of the poly-A tail in mRNA?

• to add modified guanin to the 3' end of the mRNA

• to indicate the site of translational termination

• to code for the binding of RNA polymerase to the DNA

• to help protect the mRNA from degradation by hydrolytic enzymes 

What amino acid sequence will be produced based on the mRNA codon sequence
5'-AUG-UCU-UCG-UUA-UCC-UUG-3'

• met-ser-leu-ser-leu-ser

• met-ser-ser-leu-ser-leu

• met-leu-phe-arg-glu-glu

• met-glu-arg-arg-glu-leu

Tags

NGSS.HS-LS1-1