Which of the following statements is true regarding archaeons?
A. Like bacteria, they are killed by
peptidoglycan-targeting antibiotics.
B. They have cell walls composed of chitin.
C. They do not include organisms that can
undergo methanogenesis.
D. Unlike bacteria, their cell size and cell
shape is not determined by diffusion.
E. Their transcriptional machinery is similar to
the machinery used by eukaryotes.
E
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The Intergovernmental Panel on Climate Change reported in 2007 that atmospheric carbon dioxide levels will nearly double by the end of this century. If this happens, what will be the atmospheric concentration of carbon dioxide?
A. 1.5 ppm B. 1.75 ppm C. 385 ppm D. 560 ppm E. 700 ppm
Which sex chromosome aneuploidy is not usually seen in live births?
A) XO B) XXY C) YO D) XXX
As the polypeptide is elongating during translation, what is the ribosome doing?
a. removing incorrectly added amino acids b. moving along the mRNA transcript bonding amino acids to each other c. travelling back and forth between the nucleus and the growing polypeptide with information on which amino acids to add d. removing the non-coding introns e. breaking hydrogen bonds between the tRNA and the mRNA
Large quantities of antibodies that react to the second entry of antigen and lead to formation of antigen-antibody complexes occurs in
A. anaphylaxis. B. delayed hypersensitivity. C. serum sickness. D. hemolytic disease of the newborn.