Which event of fertilization occurs first?

A. fast block to polyspermy
B. the entry of sperm DNA into the egg
C. the slow block to polyspermy
D. the acrosomal reaction
E. the cortical reaction


D. the acrosomal reaction

Biology & Microbiology

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Archaeopteris, the first known tree, has all of the following characteristics EXCEPT:

A. occurred in forests B. contained wood C. had a eustele D. had a vascular cambium E. reproduced by seeds

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Select the correct meaning for the following pedigree symbol.



A) Unaffected male
B) Unaffected female
C) Mating
D) Affected male
E) Affected female

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Choanoflagellate adhesion proteins are similar to those of animals, and researchers have discovered that even solitary choanoflagellates have these proteins. What is the current hypothesis about the relation between the choanoflagellate adhesion proteins and animal adhesion proteins?

What will be an ideal response?

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The familiar growth form represented by edible mushrooms, as well as some poisonous mushrooms, is associated with the phylum.

A. Zygomycot B. Ascomycota C. Chytridiomycota D. Basidiomycota E. Glomeromycota

Biology & Microbiology