What defines a mixture?

A.

created through a chemical reaction

B.

described by a chemical formula

C.

cannot be broken down into simpler substances

D.

can be broken down into its basic substances through physical means

Which phase in mitosis happens first?

After fertilization the zygote

When a plant is placed in pure distilled water its cell will

What would most likely happen if the kangaroo rats were killed off and removed from the food chain?

How do genes determine the traits of an organism? Explain in detail

Explain how it would be possible to have a change in a single base of DNA, but have the protein NOT change and be functional.

During DNA replication, what is the first process to occur? a:zipping up of the DNA strand for copying b:synthesis of the leading strand c:synthesis of the lagging strand d:unwinding of the parental DNA by helicase enzyme

When a person is frightened what system is most activated sympathetic or parasympathetic nervous system?

What is found in all adult echinoderms? an inability to move bilateral symmetry an ability to swim radial symmetry

Which molecule is a reactant in the first step and a final product in the fourth step of the Calvin-Benson cycle? A) RuBP B) ATP C) PGA D) CO2