Download Biology 212 Exam 2 Practice Test

Biology 212 Exam 2 Practice Test
1. The base pairs of DNA are:
a. AC:GU
b. AT:CG
c. AU:GC
d. AB:CD
2. What are the base pairs held together by:
a. Glycosidic linkages
b. Peptide bonds
c. Covalent bonds
d. Hydrogen bonds
3. Which of the following is not a step in cell signaling?
a. Response
b. Reception
c. Translation
d. Transduction
4. A molecule that binds specifically to a receptor site of another molecule is
a. Ligand
b. H2O
c. Kinase
d. Transcrition factor
5. G-proteins are activated by
a. Phosphorylation
b. Binding GDP
c. Binding GTP
d. Binding NADH
6. Once G-proteins bind to GTP it _____ the “switch
a. Activates
b. Deactivates
c. Doesn’t change
d. None of the above
7. The primer that indicates synthesis of a new DNA strand is
a. RNA
b. DNA
c. An okazaki fragment
d. A Structural Protein
8. Cyclic AMP is degraded to AMP by
a. Adenylyl cyclase
b. GTPase
c. Phosphodiesterase
d. Calmodulin
9. The elongation of the leading strand during DNA synthesis
a. Progresses away from the replication fork
b. Occurs only in the 3’ to 5’ direction
c. Produces Okazaki fragments
d. Depends on the action of KNA polymerase
10. Which enzyme cleaves to release IP-3
a. Protein kinase
b. Glucose
c. Phospholipase-C
d. G-protein
11. What type of operon allows transcription?
a. Inducible
b. Repressible
c. Transposons
d. Polymerase
12. What do repressible operons do?
a. Blocks active transport
b. Allows transport
c. Blocks transcription
d. Allows active transport
13. Repetitive sequences are
a. Sequences of RNA repeated
b. Repeated amino acids such as CCC CCC CCC
c. Sequences of repeated DNA
d. All of the above
14. Non-coding sequences of DNA can be defined as
a. Exons
b. Operons
c. Introns
d. Both a and b
15. ____ is the enzyme responsible for removing the short RNA sequences used to
initiate DNA replication:
a. ATP synthase
b. Primase
c. Helicase
d. Phosphofructokinase
e. DNA polymerase
16. If the coding strand (the strand that will serve as the template for transcription) of a
double-stranded DNA molecule has the sequence of nucleotides 3’-AGGGCT-5’, the
RNA produced by transcription would have the sequence:
a. 5’-CGAUUC-3’
b. 5’-CGUAAC-3’
c. 5’-TCAGGG-3’
d. 5’-UCCCGA-3’
e. 5’-GGGACT-3’
17. The enzymes that perform the function of attaching the proper amino acid to the 3’
end(amino acid attachment site) of tRNA molecules are called:
a. Aminopeptidase
b. Peptidyltransferase
c. Primase
d. tRNA polymerase
e. aminoacyl tRNA synthase
18. A change in the nucleotide sequence of an organism’s DNA that results in no change
in the amino acid sequence of the encoded polypeptide is called a ________ mutation
a. Frameshift
b. Silent
c. Missense
d. Nonsense
e. None of the above
19. The anticodon of a particular tRNA molecule is
a. Complementary to the corresponding mRNA codon
b. Complementary to the corresponding triplet in rRNA
c. Part of the tRNA that bonds to a specific type of amino acid
d. Changeable, depending on the amino acid that attaches to the tRNA
e. The “active sit” of the tRNA enzyme
20. Translation in the rRNA occurs in a _______
a. 3’ to 5’ fashion
b. 5’ to 3’ fashion
c. Either Direction
d. Neither Direction
21. The step that adds the primer in a PCR reaction is known as:
a. Denaturation
b. Elongation
c. Annealing
d. Pre-taqpolymerization
22. True or False – Souther blotting is done before the Gel electrolysis is completed.
23. The Lac Operon will activate in which environment?
a. High Glucose, High Lactose
b. High Glucose, Low Lactose
c. Low Glucose, High Lactose
d. Low Glucose, Low Lactose
24. Insulin is an example of which type of signaling
a. Local
b. Hormonal
c. Paracrine
d. Synaptic
25. Which Amino Acid will be phosphorylated
a. Serine
b. Threonine
c. Tyrosine
d. All of the above
26. Which is the largest level of Gene Mapping
a. Genetic Linkage
b. Cytogentic
c. DNA sequence
d. Physical Mat