1. From Gene to Protein Chapter 17
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2. Gene Expression Which of the following is the best example of gene expression?
A frog adapts to variation in its environmental temperature.
Mouse fur color results from pigment formed by gene-encoded enzymes.
DNA is replicated during the S phase of the cell cycle.
The percent of A versus a alleles in a population is altered by natural selection.
Mutation alters the sequence of a region of DNA.
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3. Genetic Code These examples demonstrate the ability of genes from one species to be expressed in a different species. This is possible because of which property of the genetic code?
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4. For each one, be sure to indicate 5′ and 3′ ends.
Complementarity The template strand of a given gene includes the sequence 3′-G C C A C G T A T C A G-5′.
What is the sequence of the non-template strand?
What is the mRNA sequence made?
For each one, be sure to indicate 5′ and 3′ ends.
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5. Transcription Describe what is occurring at each of the stages of transcription (1, 2, 3 in the figure). How does each stage move the process forward?
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6. Eukaryotic Promoters What components form the transcription complex at a eukaryotic promoter?
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7. Modification How and where are modifications made to eukaryotic mRNA before it goes to the cytosol? What role do snRNPs play?
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8. Ribosomes What is represented at each of the lettered sites and what occurs at each of these during translation?
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9. tRNA On this model of a tRNA molecule, identify each of the following:
5′ and 3′ ends
hydrogen bonds
unpaired regions
anticodon loop
binding site for amino acid
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10. Charging tRNA Aminoacyl-tRNA synthetase is an enzyme whose function is to ___________. To do so, it binds a molecule of amino acid and a molecule of ___________. After dephosphorylation, which two molecules are joined? For the appropriate tRNA to be joined to the amino acid, what must occur?
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11. Replication, Transcription, Translation Of the following, which pertain to replication, transcription, modification, or translation? Each can be used once or more than once.
anticodon
promoter
terminator sequence
tRNA
spliceosome
origin
stop codon
peptide bond
P site
GTP
amino-acid synthetase
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12. Product The final product of an expressed gene can be which of the following? Find all of the correct choices.
mRNA
tRNA
rRNA
polypeptide
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings.