Fluorine has an atomic number of 9. Then n=1 energy level has two elections, and the n=2 energy level has seven electrons. Fluorine's valence is ___.

A) + 2

B) - 2

C) + 1

D) - 1

Which best describes a difference between prokaryotes and eukaryotes? a. Prokaryotes are much larger cells than eukaryotes. b. Prokaryotes do not contain ribosomes. c. Eukaryotes do not contain cytoplasm. d. Prokaryotes do not contain organelles.

When a person's red blood cells have neither A nor B antigens, what is the blood type of this person? A. A B. AB C. B D. O

Is it possible to get any transcription of the lac operon in the absence of lactose? Why or why not? Yes, because although the repressor protein keeps transcription at a very low basal level, some transcripts will be produced and translated.

Red hair is a single-base mutation of the MC1R gene. If your mom has red hair, can you end up inheriting that trait as well? Question 5 options: Yes, red hair is a dominant trait which means the next generation will likely end up with it.

How many protons do carbon has

What do cells need to do between divisions to make sure that a full set of dna gets passed on to each daughter cell?

True or false: The central nervous system allows us to sense the environment

Which of the following statements is false regarding root hairs? a. they are outgrowths of endodermal cells c. they increase the surface area of the root b. they are outgrowths of epidermal cells d. they absorb water and nutrients

Why is it critical to divide the chromosome number in half?

The amino acid proline is one of the three amino acids that watson describes as having "special properties". what is special about proline?