Which mechanism prevents fish sperm from fertilizing frog eggs?

a. energetic barriers


b. biological barriers
c. prezygotic barriers
d. ecological barriers
e. postzygotic barriers


c

Biology & Microbiology

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At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?

A) fertilization B) cleavage C) gastrulation D) coelom formation E) metamorphosis

Biology & Microbiology

You wish to use mRNA profiles to examine the genes of a cell that are ultimately translated into proteins during times of stress. As a result, you are investigating a portion of the cell's

A) spliceosome. B) genome. C) proteome. D) transcriptome. E) microarray.

Biology & Microbiology

Some companies that produce paper will also produce a by-product that is sold as a binder (something that binds, or holds, things together). From which part of trees does this by-product come?

A) leaves B) mycorrhizae C) lignin D) stomata

Biology & Microbiology

If a bacterium containing a mutation in the avirulence gene lands on a plant that has the corresponding R gene, the bacterium may not initiate rapid cell death in the plant.

Answer the following statement true (T) or false (F)

Biology & Microbiology