Which of the following is not one of the requirements that must have existed for the chemical
evolution of life on Earth to have occurred?
a. a source of energy
b. availability of chemical building blocks
c. oxygen (O2)
d. time
e. carbon dioxide
C
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Nitrogenase is an oxygen-sensitive enzyme even though many diazotrophs are aerobic microorganisms
Indicate whether the statement is true or false.
In a tetraploid species, a euploid individual would have ___sets of chromosomes.
A. 2 B. 4 C. 6 D. 8 E. 2n+2
If a chemical inhibitor of DNA ligase was added to bacterial cells after DNA replication initiation, the outcome would be
A) elongation of both strands would not occur without ligase to join new nucleotides together. B) elongation would occur, but Okazaki fragments would not be joined together. C) elongation of the lagging strand, but not the leading strand would occur. D) normal replication would proceed as DNA ligase is not required for this process. E) too many supercoils would build up in the DNA, resulting in a halting of elongation.
The single tendon of the biceps attaches to the ____
a. clavicle b. scapula c. ulna d. radius e. humerus