Which of the following steps has not yet been accomplished by scientists studying the origin of life?
a. Synthesis of small RNA polymers by ribozymes
b. Abiotic synthesis of polypeptides
c. Formation of molecular aggregates with selectively permeable membranes
d. Formation of protocells that use DNA to direct the polymerization of amino acids
e. Abiotic synthesis of organic molecules
Answer: d. Formation of protocells that use DNA to direct the polymerization of amino acids
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The atmosphere and seas of the early Earth lacked oxygen. What kind of organisms could NOT have lived under those conditions?
A. obligate aerobes B. obligate anaerobes C. cyanobacteria D. chemoautotrophs E. All of the other choices are correct.
A polar body, once formed, has no further function and dies
a. True b. False Indicate whether the statement is true or false
Bacteriophages are:a
viruses that infect bacteria. b. plasmids that infect bacteria. c. bacteria that infect other bacteria. d. enzymes that destroy bacteria. e. recombinant organisms
Which of the following is a nuclear lamina disease?
a. Emery-Dreifuss muscular dystrophy b. Charcot-Marie-Tooth disorder type 2B1 c. Hutchinson-Gilford progeria syndrome d. All of the above