Which molecule is paired with its correct role in protein synthesis?
a. nucleus - forms peptide bonds
b. ribosome - carries dna instructions
c. mrna - joins amino acids
d. trna - transfers amino acids

Explain why phospholipid molecules form a bilayer. (3 marks)

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.