A 3. What is contained in the nucleus of an atom?

A: Protons and neutrons
B: Electrons
C: Neutrons only
D: The DNA and chromosomes

Ineed to know why d is the correct answer asap

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring