Ingo Potrykus and Peter Beyer introduced genes for
the production of beta-carotene, a precursor of
vitamin A, into rice. They used rice because rice
a. is the main food for people in impoverished
countries.
b. plants were readily available to them.
c. plants can produce some vitamin A on their
own.
d. is otherwise a complete nutrient source.
e. is all of these.
Answer: a
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Some cells have several nuclei per cell. How could such multinucleated cells be explained?
A) The cell underwent repeated cytokinesis but no mitosis. B) The cell underwent repeated mitosis with simultaneous cytokinesis. C) The cell underwent repeated mitosis, but cytokinesis did not occur. D) The cell had multiple S phases before it entered mitosis.
If a strand of DNA has the nitrogen base sequence 5'-ATTTGC-3', what will be the sequence of the matching strand?
a. 3'-ATTTGC-5' b. 3'-GCAAAT-5' c. 3'-UAAACG-5' d. 3'-TAAACG-5' e. 3'-TUUUCG-5'
The endosymbiotic hypothesis is generally accepted as the origin of eukaryotic organelles.
Answer the following statement true (T) or false (F)
In principle, what would be the minimum number of consecutive nucleotides necessary to correspond to a single amino acid to produce a workable genetic code (it can specifically code for all 20 amino acids)? Assume that each amino acid is encoded by
the same number of nucleotides. Explain your reasoning.