Solved

Gene Regulation in Bacteria and Bacteriophage Utilize the Following Terminology

Question 46

Matching

Gene regulation in bacteria and bacteriophage utilize the following terminology. Twelve terms are given below (a – l). Write the letter of the correct term. Not all letters need be used. Some letters may be used more than once.

Premises:

Responses:

phenotype with respect to β-galactosidase synthesis for the partial diploid I⁺ O⁺ Z⁺ / I^– O^c Z^–

temporal control

phenotype of I⁺ O⁺ Z^– / I⁺ O^c Z⁺

positive control

phenotype of I⁺ O⁺ Z^– / I^– O^c Z^–

negative control

phenotype with respect to the synthesis of tryptophan enzymes in the trp operon trp R⁺ O^c S⁺ (trpR codes for repressor; S = structural gene)

inducible

phenotype of trp R⁺ O⁺ S⁺ in the presence of tryptophan

noninducible

regulatory molecule must be present at site in DNA (such as promoter) so that transcription occurs

repressible

small molecules that bind to regulatory molecule, such as repressor

constitutive

During lytic cycle of lambda phage, genes concerned with DNA replication are transcribed before genes specifying head proteins, which are transcribed before tail proteins.

operator

mutation that reverses the effect of another mutation at a different site

repressor

type of operons responding to catabolite repression (glucose effect)

effector molecule

post-translational control of biosynthetic pathway

feedback inhibition

regulatory molecule that binds to operator region in DNA

suppressor mutation

Premises:

phenotype with respect to β-galactosidase synthesis for the partial diploid I⁺ O⁺ Z⁺ / I^– O^c Z^–

phenotype of I⁺ O⁺ Z^– / I⁺ O^c Z⁺

phenotype of I⁺ O⁺ Z^– / I^– O^c Z^–

phenotype with respect to the synthesis of tryptophan enzymes in the trp operon trp R⁺ O^c S⁺ (trpR codes for repressor; S = structural gene)

phenotype of trp R⁺ O⁺ S⁺ in the presence of tryptophan

regulatory molecule must be present at site in DNA (such as promoter) so that transcription occurs

small molecules that bind to regulatory molecule, such as repressor

During lytic cycle of lambda phage, genes concerned with DNA replication are transcribed before genes specifying head proteins, which are transcribed before tail proteins.

mutation that reverses the effect of another mutation at a different site

type of operons responding to catabolite repression (glucose effect)

post-translational control of biosynthetic pathway

regulatory molecule that binds to operator region in DNA

Responses:

temporal control

positive control

negative control

inducible

noninducible

repressible

constitutive

operator

repressor

effector molecule

feedback inhibition

suppressor mutation

Correct Answer:

Premises:

Responses:

phenotype with respect to β-galactosidase synthesis for the partial diploid I⁺ O⁺ Z⁺ / I^– O^c Z^–

phenotype of I⁺ O⁺ Z^– / I⁺ O^c Z⁺

phenotype of I⁺ O⁺ Z^– / I^– O^c Z^–

phenotype with respect to the synthesis of tryptophan enzymes in the trp operon trp R⁺ O^c S⁺ (trpR codes for repressor; S = structural gene)

phenotype of trp R⁺ O⁺ S⁺ in the presence of tryptophan

regulatory molecule must be present at site in DNA (such as promoter) so that transcription occurs

small molecules that bind to regulatory molecule, such as repressor

During lytic cycle of lambda phage, genes concerned with DNA replication are transcribed before genes specifying head proteins, which are transcribed before tail proteins.

mutation that reverses the effect of another mutation at a different site

type of operons responding to catabolite repression (glucose effect)

post-translational control of biosynthetic pathway

regulatory molecule that binds to operator region in DNA