Bacteria reproduce by splitting into two. This can happen every 20 minutes in ideal conditions of sufficient water, food and at a warm temperature. Small numbers of bacteria do not usually make people ill. When a student takes her lunch out of the fridge, it contains 4 bacteria. After 2 hours at room temperature, it contains 256 bacteria. From the time that the food is taken out of the fridge, how long will it take before there are 16384 bacteria in her food?

Plant cells are placed in a solution with a lower water potential than that of the cells. Which row is correct?

Using the key, which organism is a virus? 1 has a cell wall go to 2 does not have a cell wall go to 3 2 cell wall is …

What are found in plant cells but not in animal cells? 1 cell membrane 2 nucleus 3 cell wall 4 chloroplast

Which statement about dominant and recessive alleles is not correct?

What is the effect of a lack of nitrate ions on plant leaves?

Which table states the tests for different food groups?