Atoms or molecules that have an orbital with a single unpaired electron are called
A) acids
B) ions
C) free radicals
D) antioxidants
E) stable
Ans: C) free radicals
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Which class of genes controls the developmental identity of segments along the anterior-posterior axis?
What will be an ideal response?
Imagine that you are conducting experiments and you have a cell line that responds to an external hormonal signal by entering the apoptotic pathway. How would these cells respond to this hormonal signal if you could instantly and completely inactivate the Bcl-2 protein?
a) none of the choices is correct b) Since Bcl-2 normally protects cells from apoptosis, loss of this protein would prevent apoptosis. c) Since Bcl-2 normally promotes apoptosis, loss of this protein would prevent apoptosis. d) Since Bcl-2 normally protects cells from apoptosis, loss of this protein would cause these cells to go through apoptosis.
In an area with nitrogen-poor soil, legumes often dominate over other plants because they
A) have long taproots that can extract nitrogen from deeper down in the soil. B) inhibit the growth of denitrifying bacteria around their roots, thus keeping more nitrate in the soil. C) have unique access to the large atmospheric pool of nitrogen thanks to their symbiotic bacteria. D) obtain supplemental nitrogen by trapping insects and other prey. E) do not need nitrogen at all.
Please select characteristics exhibited by prokaryotes to test your understanding of the differences between prokaryotic and eukaryotic organisms.
> DNA > Nucleus > Golgi body > Ribosomes > Cell wall