How does a positive regulator affect transcription by RNA polymerase in prokaryotes?
A) by allowing passage of the polymerase through an operator
B) by interacting with RNA polymerase to increase the frequency of transcription initiation
C) by causing the helix to unwind in the operator allowing easier initiation
D) by making the transcription start site more exposed to the polymerase
B) by interacting with RNA polymerase to increase the frequency of transcription initiation
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In the sweet pea crossing experiment by Bateson and Punnet, the F2 generation had many more offspring with the phenotypes of purple flowers P, long pollen L and red flowers p, round pollen l than expected from independent assortment. This is because
A. in sweet peas, there are always more PL gametes than Pl ones. B. in sweet peas, the alleles for flower color and pollen shape are on the same chromosome. C. there were few recombination events between these genes during meiosis. D. flower color and pollen shape are within the same linkage group. E. All of the statements given are true.
Which groups of organisms have a two chambered heart?
a. Birds b. Reptiles c. Fish d. Arthropods e. Mammals
Some scientists suggest that organic molecules were introduced into Earth's atmosphere when ________ crashed into Earth
Fill in the blank(s) with correct word
How do glomeromycetes differ from basidiomycetes?
What will be an ideal response?