What was the genotype of the mother in the P generation?
Bicoid is a maternal effect gene that is essential for the development of head structures in Drosophila. The F1 generation from a cross of two phenotypically normal flies produces normal embryos, but in the F2 cross, 25% of the embryos lack heads and die.
A. BB
B. Bb
C. bb
D. Either BB or Bb
E. Either Bb or bb
B. Bb
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_______________ are constructed of all four basic tissue types.
(a) Organs. (b) Systems. (c) Cells. (d) Organelles.
Treating a bacterial infection by inoculating the host with a bacterial virus is
A. None of the answer choices is correct. B. radiation therapy. C. phage therapy. D. antibiotic therapy. E. chemotherapy.
The ATP synthase complex associated with the thylakoid membrane
A) contains a CF1 proton channel and a CFo ATPase complex. B) is identical to the FoF1 complex of mitochondria. C) performs photophosphorylation in oxygenic phototrophs. D) is a soluble enzyme complex peripherally associated with PSI. E) accepts electrons from PSI.
In a messenger RNA, what region of the mRNA does the 3' UTR refer to?
a. the coding region b. the region after the stop codon c. the region before the start codon d. the region before the site for initiation of transcription