Biology - 2nd Semester Exam Review

The double helix model used today is the product of research done by scientists

• Hershey & Chase.

• Watson & Crick.

• Franklin & Crick.

• Griffith & Chargaff.

Which of the following is the site of DNA replication in eukaryotes?

• cytoplasm

• ribosomes

• nucleus

• vacuole

Which scientist used chemical analysis to show that the genetic material in bacteria is DNA?

• Martha Chase

• Oswald Avery

• Frederick Griffith

• Alfred Hershey

How did Hershey and Chase's use of radiolabeled bacteriophages to study the genetic material validate Avery's research?

• It demonstrated conclusively that the genetic material is not protein.

• It showed that bacteriophages are not digested by bacterial enzymes.

• It proved that bacterial will take up phosphorus, but not sulfur.

• It confirmed that bacteriophages cannot inject radiolabeled DNA.

Study the single strand of DNA and identify the nucleotide sequence of the matching DNA strand: C C G T A C T

• G G C U T G U

• A A T G C A G

• G G C A T G A

• T T A C G T C

Suppose you can read the sequence of bases on only one strand of a double helix. What would you use to determine the sequence on the matching strand?

• central dogma

• x-ray crystallography

• Chargaff's rules

• base pairing rules

What does DNA polymerase do during replication?

• binds nucleotides together and corrects base pair errors

• transmits messages that are translated into proteins

• attracts amino acids to the ribosomes for assembly

• recognizes and points out new origins of replication

The lac operon is an example of how gene regulation occurs in

• yeasts.

• bacteria.

• humans.

• eukaryotes.

The nucleotide sequences that are removed during mRNA processing are called

• operators.

• promotors.

• exons.

• introns

When does mRNA take place?

• after replication

• after translation

• after transcription

• after protein synthesis