Name one source of human stem cells, other than human embryos.

How do crossovers affect populations

What happens to the star in the nebula stage?

Sulfonamides inhibit an enzyme necessary for production of purines and pyrimidines. what long-term impact would it have on a microbe if it were grown in the presence of sulfonamides?

How many cycles of PCR would it take to create 16 copies of a DNA molecule?

What is apoptosis? a. a metabolic step in blood clotting b. a type of membrane receptor c. a way to stimulate transcription d. controlled cell suicide e. a type of second messenger?

Which sentences describe star clusters?

Which of the following is an advantage of nuclear energy over fossil fuels? A. Eliminates the need for mining. B. Uses a renewable energy source. C. Releases less CO2 waste products. D. Releases more CO2 waste products.

A cell with 46 chromosomes inside itsnucleus goes through one round of mitosis and cytokinesis. How manychromosomes are inside each of the two resulting nuclei?

The theory that explains how the earths surface is made up of moving rocky plates is called: A. Supercontinent B. Plate tectonics C. Sea floor spreading D. Continental drift

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis