The benefit of sexual reproduction is the production of genetic ________ in offspring
Fill in the blank with correct word.
Answer: variety or variation
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Which of the following is true about the structure of DNA?
A. Purine and pyrimidine bases are joined by phosphodiester bonds. B. Adjacent bases are stacked on top of each other, one base pair every 0.34 nm. C. Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars. D. All of the choices are correct.
As many as 20% of present-day angiosperms are wind pollinated
A. true B. false
Which of the following is NOT a function of transposase?
A. Transposase recognizes inverted repeats. B. Transposase cleaves at both ends of the transposable element. C. Transposase carries the transposable element to a new site on the DNA. D. Transposase cleaves the target DNA at staggered sites. E. Transposase ligates nucleic acid fragments during DNA replication.
Suppose you are a biologist trying to discover the process by which DNA copies itself. You grow cells in a culture that contains a special isotope of nitrogen, N-15, which will become part of any new DNA the cell makes. After one generation, you analyze
the DNA and find all the DNA has some N-15 in it. You then take those cells and grow them for another generation in a culture with the normal isotope of nitrogen, N-14, and find that half of the DNA has some N-15 in it and half of it has only N-14. From this information, what can you infer is the process by which DNA replicates? What will be an ideal response?