Equal-sized potato pieces were placed into test-tubes containing equal volumes of different concentrations of sucrose solution and left for 30 minutes. All other variables were controlled. After 30 minutes, the potato piece in one of the concentrations of sucrose solution had not changed in size. What can be concluded from the result for this potato piece? 1 The concentration of sucrose in the potato is the same as the concentration of the sucrose solution. 2 The water potential of the potato is the same as the water potential of the sucrose solution. 3 There is no more movement of water into or out of the potato.

Which type of bond in phospholipids has a role in increasing the fluidity of cell surface membranes?

Which of these substances can pass directly through cell surface membranes without using a carrier protein or a chann…

Companion cells use ATP to move hydrogen ions out of the cell and co-transporter proteins to allow hydrogen ions to r…

The Hardy-Weinberg principle may be used to calculate allele and genotype frequencies for a gene, within a population…

Section B Answer one question. (a) Explain what is meant by the terms ecosystem and niche.

Section B Answer one question. (a) Describe the principles of the polymerase chain reaction (PCR).