What happens when a keystone species has been removed from a habitat?
a. a collapse in biodiversity
b. a reduction in predator species
c. an increase in predator species
d. an increase in biodiversity
a. a collapse in biodiversity
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In an allergic reaction, allergens bind ________, which release allergy mediators.
A) IgE antibodies on mast cell surfaces B) IgG antibodies on B cell surfaces C) allergy genes on chromosome 5 D) histamines on mast cell surfaces
Land ecosystems lose nitrogen to the atmosphere through ____
a. decomposition b. ammonification c. soil leaching d. bacterial fixation e. denitrification
Bioinformatics is a relatively new field that combines elements of genomics with computer science and mathematics
Indicate whether the statement is true or false
Which one of the following is TRUE regarding nucleotides?
A) There are three different DNA nucleotides. B) DNA nucleotides are assembled into RNA by the process of dehydration synthesis. C) DNA nucleotides contain deoxyribose; RNA nucleotides contain sucrose. D) Nucleotides are bonded together by covalent bonds between the sugars and the phosphates. E) A DNA nucleotide could be made up of ribose, a phosphate, and cytosine.