In prophase 1:
Chromosomes become visible, crossing-over occurs, the nucleolus disappears, the meiotic spindle forms, and the nuclear envelope disappears.
In metaphase 1:
The pairs of chromosomes (bivalents) become arranged on the metaphase plate and are attached to the now fully formed meiotic spindle. The centrioles are at opposite poles of the cell.
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B. the addition of one phosphate group
Explanation:
Why (for what reasons) is it believed that oxygen was not present when life formed on Earth? The life forms were anaerobic, and did not make oxygen. There is a lack of oxidized iron in rocks that are a few billion years old. Eventually oxygen from the oceans moved into the atmosphere, and iron could be oxidized.
Answer:
main difference between freshwater and marine life is the habitat they come from in the wild. Freshwater fish live in streams, rivers and lakes that have salinity of less than 0.05 percent. Depending on the species, fish can survive in temperatures ranging from 5 and 24 degrees Celsius
Explanation:
When bacteriophage is used to infect bacterial cells in culture grown under unfavorable conditions, it will incorporate its genomic DNA into the bacterial genome.
Bacteriophage, also known as a phage, is a virus which infects and replicates within bacteria. Bacteriophages contain DNA or RNA genome which is encapsulated in a protein coat.
Bacteriophages infect the bacterial cultures. When they infect the bacteria, the genomic DNA of the bacteriophage enters into the bacterial genome. It then replicates within the bacteria. It hijacks its cellular machinery so that it can and does not allow it to produce bacterial components anymore and rather produce viral components.
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