Which of the following genetic processes may be most helpful in accounting for the Cambrian explosion?
A) binary fission
B) mitosis
C) random segregation
D) gene duplication
E) chromosomal condensation
Answer: D) gene duplication
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Which of the following living reptiles care for their young and have a four-chambered heart, as birds do?
A. turtles B. crocodiles C. lizards D. snakes E. tuataras
Which is the basic unit in a skeletal muscle?
A. muscle fiber B. blood vessel C. sheath D. tendon E. ligament
The two domains of prokaryotes are Bacteria and Fungi
__________________ Indicate whether the statement is true or false.
The most common mode of HAV transmission is
A) contamination of food during preparation. B) contamination of food before it reaches a food service establishment. C) blood transfusion. D) contaminated hypodermic needles. E) airborne.