How are dna and rna molecules alike?
a. they are both double stranded.
b. they both contain nitrogen bases.
c. their nitrogen bases always pair a - t and c - g
d. they are found in the nucleus and at the ribosomes.

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient