Which of the following includes all of the pyrimidines found in RNA and DNA?
A) cytosine and uracil
B) cytosine and thymine
C) cytosine, uracil, and thymine
D) cytosine, uracil, and guanine
Answer: C
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Feedback inhibition
A. is a means of regulating the amount of product produced. B. often involves the use of allosteric enzymes. C. involves inhibiting the last of a series of reactions. D. results in raising the activation energy for the reaction. E. is a means of regulating the amount of product produced AND often involves the use of allosteric enzymes.
A recessive allele: Check all that apply.
_____ will have no noticeable effects on an organism's phenotype if a dominant allele is present _____ will never have an effect on an organism's phenotype _____ can be on either the maternal or the paternal chromosome _____ will have an effect on an organism's phenotype if the individual is homozygous for the recessive allele
The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because
A) it revealed new and unanticipated features of Mendel's pea plant varieties. B) it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. C) it allowed scientists to see the DNA present within chromosomes. D) it led to the discovery of mitochondria. E) All of the above are true.
Thiobacillus oxidizes inorganic sulfur compounds and reduces CO2. This bacterium is a
A) chemoheterotroph. B) chemoautotroph. C) photoautotroph. D) gammaproteobacteria. E) photoheterotroph.