A change in genotype, but not in phenotype, is most likely due to
A. a point mutation in the third position of a DNA triplet.
B. a nonsense mutation at the beginning of a gene.
C. thymine dimer formation in the coding region of a gene.
D. a mutation that leads to a frameshift in the middle of a gene.
Answer: A
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If the concentrations of CO2 and O2 were equal in the atmosphere, rubisco would favor CO2 over O2 as a substrate by about 2000:1 at 25 °C. Why, in today's atmosphere (and at 25 °C), is the photosynthesis/photorespiration ratio of C3 plants only about 4:1?
A. O2 is much more abundant than CO2 in today's atmosphere. B. Rubiscos that are more selective for CO2 are slower. C. O2 is continually produced in the leaves of C4 plants. D. RuBP reacts readily with O2.
A mixture of DNA fragments is amplified from a sample of ocean water. Which gene(s) could be definitively categorized as originating from a species of animal?
A. Genes for ATP synthase B. Genes for RuBisCO C. Gene for Spongin D. Cell cycle regulatory genes E. Genes for biosynthesis of chitin Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about animal genes? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process ·Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Double fertilization is
A. fertilization of two eggs in the same flower.B. fertilization of an egg by two sperm. C. fertilization of an egg by one sperm and an endosperm-forming cell by another sperm. D. fertilization of two eggs by the same sperm. E. fertilization of an egg and an endosperm-forming cell by the same sperm.
What type of microscopy allowed scientists to visualize the cytoskeleton in living cells?
A) transmission electron microscopy B) scanning electron microscopy C) fluorescence microscopy D) light microscopy