What is the Chargaff Rule?

The chemical compound urea is a? A. Bile pigment. B. Carbohydrate metabolite. C. Nitrogenous waste. D. Bile salt.

If a cell at metaphase of mitosis contains 20 sister chromatids, how many chromosomes will be present in a g1 cell

Which term is the name of the diploid stage of the plant life cycle? gametophyte sporophyte sperm egg

Why do viruses need living hosts, such as bacteria or eukaryote cells? (SB4c) A) The host cell is the source of food for the virus. B) Viruses depend on the host cells that they infect to reproduce.

The mass of fibrocartilage that fills the gap between two ends of a broken bone in the early stages of healing is called

List the three type of blood vessels and their characteristic blood flow

The reaction mixture for PCR is missing the enzyme Taq polymerase. Which step of PCR would this affect?

compare and contrast the functions of each of the following types of flask: filter, Erlenmeyer, volumetric

Which of the following is not a factor in determining if an animal should be placed on the endangered species list? the animal's fur is valuable to humans. the animal's habitat is threatened. the animal is predated on significantly by other animals.

In Costa Rica one can find the Arenal Volcano surrounded by the Cloud Forest, a rainforest, and multitudes of life forms. This area demonstrates the interaction of which of the following "spheres"? Check all that apply. A. biosphere B. exosphere C.