List the eight key components of the flowering plants life cycle.
What will be an ideal response?
1. The diploid sporophyte is dominant and bears a flower.
2. The flower produces microspores and megaspores by meiosis.
3. The microspore undergoes mitosis and produces pollen.
4. The megaspore undergoes mitosis and becomes the female gametophyte.
5. The pollen grain travels by the pollen tube into the embryo sac.
6. The sperm fertilizes the egg to develop the embryo.
7. The ovule develops into a seed and the ovary becomes the fruit.
8. The seed germinates and forms a new sporophyte.
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Which of the following is an important consequence of the evolution of diatoms and coccolithophorids?
A. They dominated photosynthesis in the oceans. B. The silica and calcium carbonate contained in these organisms became a primary source of carbonate sediments on the seafloor. C. They produced respective "blooms" in the ocean. D. They led to the extinction of cyanobacteria. E. None of these answer options is correct.
What happens in the third step of the type I topoisomerase reaction?
A. The enzyme changes to the open conformation. B. The unbroken DNA strand passes through the break in the first strand. C. Active-site tyrosine acts as a nucleophile and attacks one strand to form an enzyme-linked intermediate. D. The enzyme changes to the closed form. E. The 3' OH of the broken strand attacks the link between the active site tyrosine and the 5' end of the broken strand, resulting in religation of the broken strand.
Which two enzymes do DNA researchers need to cut and paste DNA from different sources?
a. restriction enzymes and DNA ligase b. restriction enzymes and DNA polymerase c. DNA ligase and DNA polymerase d. restriction enzymes and helicase
e. helicases and DNA polymeraseVertebrate bone consists primarily of a crystalline mixture of
A. Ca2+; SO4?2. B. Na+; Cl?. C. Ca2+; Cl2. D. Ca2+; PO4?2. E. Adenosine, PO4?2.