In an mRNA molecule, each 3-base sequence is called a ____________ . Any one amino acid can be coded for by several of these 3-base sequences.
What will be an ideal response?
codon
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It has been observed that when the sugar source changes in a growth medium, the growth rate of yeast vary widely in response. Some strains of yeast are slow to induce catabolic operons while other strains quickly synthesize proteins to process the new sugar. What might be one explanation for this difference in the growth rate of the strains?
A. Operons for anabolic pathways are controlled by many global regulatory mechanisms, and different sugars can favor initiation of different pathways depending on the strain of yeast. B. Different sugars can act as effector or repressor molecules in various strains, promoting or inhibiting transcription of genes depending on the type of sugar present. C. Catabolic repression strategies of operons for using different sugars may vary among strains, thereby favoring initiation of transcription in one strain over another depending on the sugar. D. All of the choices are correct.
Which level of organization reflects an individual composed of multiple organ systems?
Which level of organization reflects an individual composed of multiple organ systems?
The above figure represents
a. petunia eggs. b. pine pollen. c. pansy spores. d. petal fragments. e. poppy seeds.
The California populations of the Northern elephant seal are descendants from a very small population of seals that was overhunted in the 1890s. Heterozygosity in this population would be expected to be ________ due to ________.
A. great; a bottleneck effect B. slight; a bottleneck effect C. great; assortive mating D. slight; the founder effect E. great; disruptive selection