Scientists believe that the first organisms that appeared on Earth were prokaryotic. Which of the following best represents what the cell structure of these organisms may have looked like?

What controls the rate of chemical reactions in the cytoplasm

When you are exposed to disease-causing germs, which type of tissue is your first line of defense? epithelial connective muscle nervous

What is the function of the nucleus?

A middle age star that burns hydrogen is a A. Main sequence star B. Neutron star C. White dwarf D. Pulsar

Duchenne muscular dystrophy is a sex-linked disorder. If a father has a normal X chromosome and the mother is a carrier, what are the odds that a male child would have Duchenne muscular dystrophy?

What are restriction enzymes used for in nature?

Material with bits of rocks and once living parts of animals are

Think about a flower growing in your garden you notice that all of the leaves are falling off why is this a problem for the plant

How does polymerase chain reaction make DNA fingerprinting more reliable

A) What are the bases of mRNA coded for by this section of DNA before the mutation? Hint in RNA A pairs with U.