Bio 101 SI Exam Review 3

What is the central dogma of molecular biology?

• RNA → DNA → Protein

• DNA → RNA → Protein

• Protein → DNA → RNA

• DNA → Protein → RNA

Which of the following is NOT a requirement for genetic material?

• Must store genetic information

• Must be unstable and easily mutated

• Must be accurately replicated

• Must undergo mutations for variability

What did Chargaff’s rules state?

• DNA is made of equal amounts of adenine and guanine

• DNA composition is the same for all species

• DNA has equal amounts of adenine with thymine and guanine with cytosine

• DNA is a single-stranded molecule in all organisms

What is the function of DNA helicase in replication?

• DNA helicase

• DNA polymerase

• RNA polymerase

• DNA ligase

What are Okazaki fragments?

• They are produced during leading strand synthesis

• They help in unwinding the DNA helix

• They are short DNA fragments synthesized on the lagging strand

• They code for protein synthesis

In eukaryotic DNA replication, where does replication begin?

• At a single origin of replication

• At multiple points along the chromosome

• Only at the 5’ end of the DNA strand

• Only at the 3’ end of the DNA strand

Which of the following is NOT a level of gene expression control in eukaryotic cells?

• Chromatin structure

• Transcriptional control

• Replication control

• Posttranslational control

What is the function of histone proteins in chromatin structure?

• They break down mRNA.

• They regulate transcription factors.

• They help package DNA into a compact structure.

• They act as enzymes for DNA replication.

Which type of chromatin is transcriptionally active?

• Euchromatin
• Heterochromatin
• Barr Bodies

• Oncogenes

What is the function of transcription factors?

• They assist in the binding of RNA polymerase to the promoter.

• They degrade mRNA.

• They repair DNA mutations.

• They modify histone proteins.