Which of the following is true?
A. Much of the genome does not encode proteins.
B. The genome consists of entirely protein-encoding genes.
C. An amino acid encodes a gene.
D. DNA has five types of nucleotide bases.
Answer: A
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Explain why adult animals and plants replace many of their cells throughout their lifetimes.
What will be an ideal response?
A harmful substance that the liver produces when metabolizing fatty acids is ________.
A) urea. B) ammonia. C) rancid fatty acids. D) ketone bodies. E) beta units.
The epidermis that covers the skin is a simple organ
Indicate whether the statement is true or false
The unidirectional flow of blood in venules and medium-sized veins is maintained by:
pressure from the left ventricle the muscular walls of the veins arterial pressure the presence of valves all of the choices are correct