Which of the following group is most closely related to mammals?
A. Reptiles
B. Amphibians
C. Lancelets
D. Cartilaginous fishes
Answer: A
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Which of the following most accurately describes a polar covalent bond?
A. the interaction of a hydrogen connected to an atom with a high electronegativity, and an electronegative atom of another molecule B. the interaction of an atom with very high electronegativity and an atom with very low electronegativity C. the unequal sharing of electrons between an atom with a partial positive charge and an atom with a partial negative charge D. the equal sharing of electrons between atoms of identical or similar electronegativities E. None of these choices accurately describe polar covalent bonds.
In order to produce human insulin in bacteria what must be done first?
A. Human insulin protein is purified from the bacteria. B. The human insulin gene must be cloned. C. The human insulin gene must be transformed into bacteria. D. Bacteria containing the human insulin gene are grown. E. The bacterial insulin gene must be cloned.
The division of the peripheral nervous system that carries signals to voluntary muscles is the system.
A. somatic B. autonomic C. sympathetic D. parasympathetic E. None of the answer choices is correct.
A slimy layer of bacteria coating a surface is also known as
a. prokaryocommune b. bioaggregate c. tissue d. biofilm e. plague