Describe the hydrogen hypothesis and why it is favored over other hypotheses
What will be an ideal response?
Answer: The hydrogen hypothesis states that a hydrogen-consuming archaea served as a host for the stable incorporation of a hydrogen-producing facultative anaerobic bacterium. This hypothesis describes the first eukaryotic cells as ones without nuclei. It accounts for eukaryotes having bacteria-like ATP-producing pathways in hydrogenosomes and the presence of bacteria-like lipids in eukaryotes. Neither of these is accounted for in other hypotheses that state that eukaryotes first contained nuclei and lacked mitochondria.
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Two-dimensional gel electrophoresis
A. can be used to resolve thousands of proteins in a complex mixture. B. separates proteins based on their isoelectric pH. C. separates proteins based on their size. D. All of the choices are correct.
Which of the following statements is true regarding the vascular cambia of ancient (extinct) lycophytes? Select all correct choices
A. Ancient lycophytes did not possess vascular cambia. B. Ancient lycophytes had vascular cambia that formed only secondary phloem. C. Ancient lycophytes had vascular cambia that formed only secondary xylem. D. Ancient lycophytes had vascular cambia that formed both secondary xylem and secondary phloem.
Define the terms penetrance and expressivity and explain how they affect the expression of single gene traitsWhat will be an ideal response?
What is the major challenge of the molecular clock approach?
a. DNA sequences can change at different rates. b. Homologous sequences are difficult to find and identify. c. There are no data from the geological record that can be combined with the molecular data to set the clock. d. All of these are challenges.