1) The density of a substance is the ratio of its mass to its volume. The formula for density is: D = mass/volume. If the density and the volume of a liquid are known, its mass can be found by

The cell theory consists of all of the following except

In the Earth's mantle, heat is transferred in large convection currents. Within these currents, A. hotter and cooler rock sink but do not rise. B. cooler rock rises and hotter rock sinks. C. cooler and hotter rock rise but do not sink. D.

Which cells have DNA

Describe how the expression of genes can lead to cancer.

Eric and janelle are both carriers of the recessive allele causing tay-sachs disease, which is lethal in early childhood. if they have a baby, what is the probability that this child would have tay-sachs disease?

Which statements are true of heterogeneous mixtures? 1) they settle out. 2) the proportions of solute to solvent may vary. 3) the solute is evenly distributed throughout. 4) they are composed of two solvents and two solutes. a. 1 and 2 b. 2 and 4 c.

Why do plants not need heterotrophs

During development, individual cells of the same organism begin to produce different proteins because A) not all cells can synthesize proteins. B) specific genes are activated in the cells. C) the cells have different numbers of chromosomes.

Most scientists believe earth's early archean atmosphere was formed primarily by gases released from:

Choose the words to finish the sentence A strand of DNA is a polymer of Choose ... joins by covalent bonds between the Choose ... of one monomer and the Choose ... of the next monomer A strand ...