Which of these levels of biological organization includes all of the others in the list:
a. organ
b. Molecule
c. Cell
d. Tissue
Ans: a. organ
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The ____ provides evidence that RNA molecules generated the first proteins
a. redundancy of the genetic code b. ability of rRNA to catalyze the formation of peptide bonds between amino acids c. polymerase activity of some ribozymes d. cleavage of mRNA molecules by rRNA e. physical structure of polypeptides
In a population in Hardy-Weinberg equilibrium, 75 percent of the individuals have a dominant allele for a particular gene (p=0.75) and 25 percent have a recessive allele (q=0.25). The proportion of homozygous recessive individuals in the F1 generation will be
A) 2.5%. B) 6.25%. C) 18.75%. D) 0%.
What happens during photorespiration?
A) The Calvin cycle produces twice as much glyceraldehyde 3-phosphate (G3P). B) The enzyme rubisco uses oxygen as its substrate for the reaction with ribulose bisphosphate. C) Ribulose bisphosphate (RuBP) is broken down into glycolate. D) A second wave of light reactions occurs to replace the Calvin cycle.
Which of the following best describes the definition of a gene?
A. the protein product that genetic material produces B. genetic information that produces a product, either proteins or RNA C. a section of DNA that produces a single protein product D. a collection of polypeptides that fold to form a complex protein