AP Biology Unit 5

Negative control of gene expression is mediated by __ and results in a(n) __ in the frequency of transcription.

• activators, increase

• activators, decrease

• repressors, increase

• repressors, decrease

RNA polymerase moves in which direction along the DNA?

• 5' to 3' 

• 3' to 5' along the template strand

• 3' to 5' along nontemplate(coding) strand

• 5' to 3' along the template strand

Accuracy in the translation of mRNA into the sequence of amino acids in a polypeptide depends on specificity in which of the following?

• binding of ribosomes to mRNA

• shape of the A and P sites of ribosomes

• attachment of amino acids to tRNAs

• bonding of the anticodon the codon and the attachment of amino acids to tRNAs

what does a promoter do?

• it allows a gene to be transcribed

• it creates a DNA segment

• it is another word for ribosomes

• it is another word for RNA

What feature did Hershey and Chase use to differentiate between the protein and nucleic acid in their experiment?

• Proteins have phosphorus and Nucleic acids have sulfur

• Proteins have sulfur and Nucleic acids have phosphorus

• Proteins are single stranded and Nucleic acids are double stranded

• Proteins are double stranded and Nucleic acids are single stranded

Both eukaryotes and prokaryotes have plasmids. What are plasmids?

• large extra-chromosomal, double-stranded, linear DNA molecules

• large extra-chromosomal, double-stranded, circular DNA molecules

• small extra-chromosomal, double-stranded, circular DNA molecules

• small extra-chromosomal, double-stranded, linear DNA molecules

Which of the following genetic engineering techniques is incorrectly described?

• Electrophoresis separates molecules based on size & charge

• Bacterial transformation introduces DNA to bacterial cells

• PCR allows for DNA fragments to be stabilized for engineering processes

• DNA sequencing determines the order of nucleotides in a DNA molecule

Which of the following describes the orientation of the DNA found in a run gel electrophoresis?

• Small fragments are found near the well since it is negatively charged

• Large fragments are found near the well while small fragments are found at the other end.

• Small fragments are found near the well while small fragments are found at the other end.

• Large fragments are found near the well since it is positively charged

Identify two populations with statistically significant differences in the mean stem trichome densities. Justify.

• I & II, error bars overlap

• I & II, error bars do not overlap

• I & III, error bars do not overlap

• I & III, error bars overlap

Tags

NGSS.HS-LS4-3

After a cellular response is achieved, how is it terminated?

• the ligand and receptor separate

• block the transduction pathway

• the cell will keep responding

• send out a different signal