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
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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
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.
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
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)