Why do the cells of the digestive system secrete certain enzymes, such as pepsin, in their inactive forms?
What will be an ideal response?
Ans: These proteolytic enzymes, in active form, would digest the very tissues that synthesize them.
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Oceans and the tropical rain forests contribute equally to global productivity
Indicate whether the statement is true or false.
DNA contains all of the following nitrogen-containing bases EXCEPT ____
a. adenine b. uracil c. guanine d. adenine e. thymine
The Salalizard is a fictional vertebrate that lives in the forest and appears to be half salamander and half lizard. You are not allowed to collect any wild animals, so you decide to take a video of it to show your colleagues. What behavior best
distinguishes the Salalizard as either a salamander (amphibian) or a lizard (reptile)? A) what the animal eats B) if it lives in trees C) where it reproduces D) whether it is active at night
Which of the following types of plasmids allows a bacterial cell to kill its competitors?
A) virulence plasmids B) fertility plasmids C) bacteriocin plasmids D) resistance plasmids E) cryptic plasmids