The male urethra is typically sterile
Indicate whether the statement is true or false
TRUE
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Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic. B. polyphyletic. C. paraphyletic. D. a supergroup. E. a kingdom.
How does a phage transfer DNA from one bacterium to another?
a. Phages form a bridge between bacterial cells that allows DNA to pass from the host cell to the recipient cell. b. Phages form a bridge between bacterial cells that allows DNA to pass in both directions between the two cells. c. Phages lyse bacterial cells, releasing bacterial DNA into the environment, which is taken up by other phages for transfer to new cells. d. When phages assemble in an infected bacterial cell, they may incorporate host DNA; released phages may attach to other cells and inject the bacterial DNA into those cells. e. Phages attach to receptors on bacterial cells and receive some of the target cells’ DNA; the phages release this DNA into the environment to be taken up by other bacterial cells.
The class decided to humanely euthanize the organism and subsequently dissect it. Having decided that it was probably not a reptile, two of their original hypotheses regarding its identity remained
Which of the following, if observed, should help them arrive at a conclusive answer? A) presence of moist, highly vascularized skin B) presence of lungs C) presence of a nerve cord D) presence of a digestive system with two openings
Which scientist is given credit for proposing the endosymbiont theory?
What will be an ideal response?