When does crossing over occur in meiosis?

A. prophase I

B. metaphase I

C. metaphase II

D. prophase II

Why is it important for chromosomes (dna to be copied before cell division?

In a bacteria growing experiment, a biologist observes that the number of bacteria in a certain culture triples every 1 hours. after 5 hours, it is estimated that there are 1 million bacteria in the culture.

D. One year 7. Which of the following is NOT a characteristic of topsoil? A. It develops very slowly and is the most utilized part of soil B. It makes up the top two to eight inches of soil C.

Which injury would likely cause the body which is mixed with proteins to break them into amino acids

You have two parental varieties of peas: tall plants with axial flowers and short plants with terminal flowers.

According to the plate tectonics theory, what provides the energy for the constructive forces on earths surface?

What is the direct source of energy for phototrophs

Which best describes the effects of hurricanes? A. Hurricanes tend to deposit more sediment than they remove. B. Hurricanes have storm surges that cause widespread flooding. C. Hurricanes have wind gusts that are fast but generally weak. D.

Large amounts of atmospheric carbon dioxide are absorbed by a.) animals b.) oceans c.) volcanoes d.) petroleum

What does yeast metabolize?