Mcat Biology Question Pack 1 Study Guide Questions And Correct Answers

In the macronucleus, the genes for rRNA are located extrachromosomally. This suggests that the rRNA genes are: A) nonlinear B) nonfunctional C) self-replicating D) rearranged {Ans: C) self-replicating Genes are strands of DNA, so this must mean that they are strands of DNA that are not part of the cell's chromosomes. These strands must self-replicate just as the chromosomes do if they are to be passed from one generation to the next.}When viewing an X-ray of the bones of a leg, a doctor can tell if the patient is a growing child, because the X-ray shows: A) cartilaginous areas in the long bones B) bone cells that are actively dividing C) the presence of haversian cells D) shorter-than-average bones {Ans: A) cartilaginous areas in the long bones Long bones grow via endochondral ossification, which requires cartilaginous growth plates at the ends of long bones, that thicken as cartilage and later become ossified.}All of the following are functions of mammalian skin EXCEPT: A) sensation B) respiration C) protection from disease D) protection against internal injury {Ans: B) respiration Mammalian skin is involved with touch sensation and with protection from disease and internal injury. However, in mammals, skin is