A woman with sickle cell anemia mates with a man whose (biological) mother had sickle cell anemia, but he does not have it (he is “normal”).  Which answer fits the predicted phenotype(s) of their offspring with respect to sickle cell anemia?

The most widely accepted date for the age of the Earth based on scientific evidence is about:

The DNA of an organism is studied and found to contain 30% cytosine. This organism should have __% thymine and __% adenine in its DNA.

The insertion or deletion of one nucleotide base in DNA (in an exon region) probably results in

The final electron acceptor during aerobic cellular respiration is

Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to sucrose but permeable to water, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 Msucrose solution. At 10-minute intervals, the bags were weighed and the percent change in mass (compared to the starting weight) of each bag was graphed. For which line or lines does the data indicate that the solution in the bag was hypotonic compared to the solution in the beaker at both the beginning and the end of the experiment?

Which of these processes DIRECTLY produces the greatest amount of ATP in human cells? (That means just the ATP produced in this process itself).

Bleach has a pH of 12; borax has a pH of 9.  Bleach is:

Disruptive selection, where there is selection against hybrids, can genetically split a population in the same geographic location into two or more species.  This process of speciation is called:

The __________ period is often called the Age of Amphibians due to the diversification and dominance of that group during this time, but it was also when the plants that formed most of the known major coal deposits lived.