What was the significance of the 1978 finding by Philip Leder's research group that the 0.7 kb ?-globin mRNA is not colinear with the gene that encodes it, but the nuclear 1.5 kb pre-mRNA is?
What will be an ideal response?
This meant that the ?-globin contains an intron, which is spliced out after pre-mRNA processing, and the exons are spliced together to make a mature mRNA. The significance was the realization that genes could be "in pieces."
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At some of the lowest light concentrations, ________ can still grow well due to their ________, which effectively harvest photons for energy
A) green bacteria / antenna pigments B) green bacteria / chlorosomes C) purple bacteria / antenna pigments D) purple bacteria / chlorosomes
Is this telophase of an animal or plant cell? How do you know?
1.Animal—there is a cell plate.
2.Plant—there is a cleavage furrow.
3.Animal—there is a cleavage furrow.
4.Plant—there is a cell plate.
Which of the following is NOT involved in nitrogen
fixation? a. breaking triple bonds b. production of NH3 c. production of NO3– d. production of NH4+ e. All of these are involved in nitrogen fixation
All of the following are true regarding systematics EXCEPT that it
A. is the study of the diversity of organisms at all levels of organization. B. relies on data from the fossil record, homology, and molecular data. C. is the specific study of identification, naming, and classification of organisms. D. utilizes protein, DNA, and RNA comparisons to determine relatedness of individuals.