MCB 250 Exam 4 questions with 100%
complete solutions graded A+
What happens at the maternal-to-zygotic transition across species?
A. The embryo converts from a syncytial blastoderm to a monolayer of cells
B. The maternal yolk used as an energy source is depleted
C. The embryo goes from being haploid to diploid
D. Activation of transcription from the zygotic genome - correct answer ✔✔D.
Activation of transcription from the zygotic genome
Nusslein-Volhard and Wieschaus conducted a genetic screen hoping to
understand:
A. How the body plan of the embryo is established
B. How the Toll signal transduction pathway works
C. How transcription factors are regulated during embryogenesis
D. How mRNAs can be localized to different parts of the cell - correct answer
✔✔A. How the body plan of the embryo is established
The signal that localizes the bicoid mRNA is found:
A. In the promoter
B. In the 3'UTR
C. In the 5'UTR
D. In an intron - correct answer ✔✔B. In the 3'UTR
, What is the transcription factor that activates genes that specify ventral identity in
the Drosophila embryo?
A. Dorsal
B. Cactus
C. Toll
D. Spatzle - correct answer ✔✔A. Dorsal
Why are different genes that are controlled by the same transcription factor
activated in different spatial patterns?
A. Some enhancers also have binding sites for repressors that counteract that
transcription factor activity
B. There are a different number of binding sites for the transcription factor in their
enhancers
C. There are differences in the chemical affinity of the binding sites in their
enhancers for the transcription factors
D. All of the above - correct answer ✔✔D. All of the above
The study of which model organism led to the discovery of transposons?
A. Maize
B. Fruit flies
C. Sea squirt
D. Mouse - correct answer ✔✔A. Maize
The ends of a transposon consist of:
A. Inverted repeats
B. Unique sequences
complete solutions graded A+
What happens at the maternal-to-zygotic transition across species?
A. The embryo converts from a syncytial blastoderm to a monolayer of cells
B. The maternal yolk used as an energy source is depleted
C. The embryo goes from being haploid to diploid
D. Activation of transcription from the zygotic genome - correct answer ✔✔D.
Activation of transcription from the zygotic genome
Nusslein-Volhard and Wieschaus conducted a genetic screen hoping to
understand:
A. How the body plan of the embryo is established
B. How the Toll signal transduction pathway works
C. How transcription factors are regulated during embryogenesis
D. How mRNAs can be localized to different parts of the cell - correct answer
✔✔A. How the body plan of the embryo is established
The signal that localizes the bicoid mRNA is found:
A. In the promoter
B. In the 3'UTR
C. In the 5'UTR
D. In an intron - correct answer ✔✔B. In the 3'UTR
, What is the transcription factor that activates genes that specify ventral identity in
the Drosophila embryo?
A. Dorsal
B. Cactus
C. Toll
D. Spatzle - correct answer ✔✔A. Dorsal
Why are different genes that are controlled by the same transcription factor
activated in different spatial patterns?
A. Some enhancers also have binding sites for repressors that counteract that
transcription factor activity
B. There are a different number of binding sites for the transcription factor in their
enhancers
C. There are differences in the chemical affinity of the binding sites in their
enhancers for the transcription factors
D. All of the above - correct answer ✔✔D. All of the above
The study of which model organism led to the discovery of transposons?
A. Maize
B. Fruit flies
C. Sea squirt
D. Mouse - correct answer ✔✔A. Maize
The ends of a transposon consist of:
A. Inverted repeats
B. Unique sequences
