Helicobacter pylori uses the enzyme urease to counteract a chemical defense in the human organ in which it lives. This chemical defense is

a. lysozyme.
b. hydrochloric acid.
c. superoxide radicals.
d. sebum.
e. complement.


Ans: b. hydrochloric acid.

Biology & Microbiology

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Currently, genetic manipulation is used to increase the numbers of endangered __________

a. fishes b. insects c. mammals d. plants

Biology & Microbiology

Four of the five structures listed below are found in

at least some protists. Select the exception. a. cell membrane b. pili c. mitochondrion d. eyespot e. food vacuole

Biology & Microbiology

One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered? 

A. paracrine B. autocrine C. endocrine D. direct contact E. synaptic

Biology & Microbiology

If an individual has genotype AaBb, how many different gametes can he or she produce? What combinations of alleles are possible?

What will be an ideal response?

Biology & Microbiology