In Arabidopsis, the monopteros gene regulates:a
positional effects in leaves.
b. the activity of the vascular cambium.
c. the differentiation of wounded parenchyma cells into tracheids.
d. apical-basal pattern formation.
e. the location of the preprophase band.
D
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A lacOc mutant would
A) never express lac structural genes. B) constitutively express the lac structural genes. C) not bind to lacI. D) use glucose before using lactose as a carbon and energy source. E) not bind to lacI and never express lac structural genes.
The lineage that first separated from the common ancestor of all animals, and retains many of the same primitive features to this day, includes which of the following modern organisms?
a. The grasshopper b. The sea turtle c. The jellyfish d. The sponge e. The earthworm
In the disease elephantiasis, lymph vessels become blocked as a result of infection with parasitic worms. Which of the following processes would be impacted by this disease?
A. the return of excess interstitial fluid to the
bloodstream
B. the diffusion of water and small molecules
across the wall of the capillary
C. the flow of water back into the capillaries
by osmosis
D. the generation of pressure to filter
materials through the capillary walls
E. the exchange of oxygen and other
materials between the blood and body cells
What signals termination of translation in bacteria?
A) the stop amino acid is attached to the growing peptide chain B) EF-Tu and EF-G C) ribozymes D) a tRNA specific to the stop codon enters the ribosome's A site E) RF1 and RF2