A radioactive tracer has a half life of 2 hours. How much of a 2500 g sample will be available after 24 hours?

A) 2.44 g

B) 1.22 g

C) 0.610 g

D) 0.31 g

Which of the following steps happens first during transcription? A. RNA polymerase reaches the end of the gene. B. RNA polymerase reaches the beginning of a gene. C. RNA polymerase pulls apart the double helix. D.

You are performing experiments on viruses. You have a variety of enzymes in your lab that target different organelles or macromolecules. Which enzyme will be most effective in destroying viruses?

The molecular sequence, or blueprint for a protein, is originally carried by which molecule?

What do theories hypothesize about the conditions of Earth's early atmosphere? Little to no oxygen Low levels of ultraviolet radiation Protective atmosphere Very cold temperatures

Which best describes the nature of photosynthesis?

According to the scientific theory of the origin of life on earth, life arose in a series of steps beginning with inanimate chemicals. do scientists think this process is still happening on our planet today?

Substances that go IN to a chemical reaction is called what? A) Reactant. B) Product. C) Subscript. D) Coefficient.

Which statement describes the relationship between plants, animals, and the carbon cycle?

In a glass you have 76% salt water also you have an egg which is 90% water inside, which way would the water move.

Explain how the water cycle functions because of change in matter.