Which of the following statements is consistent with the observation that the genetic code is nearly universal for all currently known life?
A. All organisms can reproduce with any other organism.
B. All organisms have a common ancestor.
C. All organisms have the same evolutionary genes.
D. All organisms arose at the same time in the history of the earth.
B
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The semiconservative model of replication means that each strand will consist of some newly synthesized DNA and some parental DNA
A. true B. false
The skin surface is a very favorable environment for colonization by most microorganisms.
Answer the following statement true (T) or false (F)
Which of the following is responsible for closing off the airway during swallowing?
a. the larynx b. the epiglottis c. the pharynx d. the intercostal muscles
The phylum Nematoda includes which of the following very common organisms, some of which are parasitic and most of which are often found in soil?
A) Flatworms B) Earthworms C) Segmented worms D) Roundworms E) Tapeworms