Discuss the advantages and disadvantages associated with the production of ammonia, urea, and uric
acid. What will be an ideal response?
Ammonia is the direct product of deamination and thus is energetically inexpensive; although it is
water soluble, it is highly toxic. The synthesis of both urea and uric acid require an additional energy
input by cells, but both are nontoxic. Uric acid is insoluble in water and thus can be excreted as a
paste, reducing water loss; it can also be safely stored in the eggs of birds and reptiles. Because urea is
highly soluble, considerable water must be used to excrete it, and consequently the organism risks
desiccation
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Imagine you were there when Stanley Miller carried out his experiment about the building blocks of life. If Miller originally identified five different amino acids, how many polypeptides that are 10 amino acids long
could be made from just these five amino acids? A. 5 ×10 = 50 B. 105 = 100,000 C. 510 = 9,765, 625 D. Cannot be determined
If an organism has two copies of each chromosome, it is
A. aneuploidy. B. diploid. C. haploid. D. tetraploid. E. polyploidy.
Which branch of this phylogenetic tree identifies Bacteria?
a. A b. B c. C d. D e. E
The nucleus includes all of the following EXCEPT__________.
a) cytoplasm b) nuclear envelope c) DNA d) nucleolus e)chromatin