You are experimenting with cell division on the root cells in an Allium cepa plant in your lab. Before they can divide the DNA must be copied, but the cells seem to only be copying part of the DNA and stopping. Which material might the cell not have enough of to replicate its DNA? A. Triglycerides B. Ribosomes C. Uracil D. Cytosine

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia