Which one of the following is an adaptation shared by virtually all complex multicellular organisms that allows the organisms to receive the oxygen and nutrients they need?
A. amplification of surface areas
B. active transporters for oxygen and glucose
C. restricted body size that corresponds to
the environment
D. tissues or organs that function as pumps
A
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Why are pea plants (Pisum sativum) a good species for genetics studies?
A. They have many distinctly identifiable forms of genetic traits.
B. They can be self-fertilized for true-breeding genetic traits.
C. They produce large numbers of offspring (the peas).
D. All of the answer choices are correct.
E. Growth of pea plants is simple and easy.
Although heavy metals are no longer widely used as germicides, ________ is an effective algicide in lakes and swimming pools.
A. lead acetate B. silver nitrate C. mercuric chloride D. copper sulfate
The glycocalyx is:
A. combination of proteins and lipids that protrude from the external surface of the plasma membrane B. combination of glycoproteins and glycolipids that protrude from the external surface of the plasma membrane C. combination of glycoproteins and carbohydrates that protrude from the external surface of the plasma membrane D. combination of lipoproteins an carbohydrates that protrude from the external surface of the plasma membrane E. combination of glycoproteins and cholesterol that protrude from the external surface of the plasma membrane
Which of the following contains codons?
A) Transfer RNA B) Messenger RNA C) Ribosomal RNA D) RNA polymerase E) DNA