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


B.  crocodiles

Biology & Microbiology

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Which of the following is an example of a hydrocarbon?

a. C2H6O b. C8H18 c. C6H12O6 d. CO2 e. C2H6S

Biology & Microbiology

DNA replication in eukaryotes is sped up by multiple origins of replication.

a. true b. false

Biology & Microbiology

Which of the following structures is made of membranes? 

A. nucleolus B. centriole C. chloroplast D. ribosomes

Biology & Microbiology

All of the following are correct about the autoclave, except

A) Sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures. B) It is the temperature that kills the microbes, not the pressure by itself. C) It is important not to overload the chamber. D) It is effective for sterilizing powders, oils, and waxy substances. E) The duration of the process depends on how full the chamber is.

Biology & Microbiology