The base sequences that are left behind after the introns have been spliced out by enzymes are the ________
A) genes
B) anticodons
C) exons
D) phosphates
C
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A human cell has a mutation in the gene that encodes the enzyme that generates lactate from pyruvate, rendering that enzyme completely non-functional. Assuming that there is ample glucose present, how would this cell generate energy in the presence of oxygen?
A. aerobic respiration B. glycolysis coupled with ethanol fermentation C. primarily through the break down of proteins into amino acids D. This cell would have no way to generate energy under these conditions because it cannot carry out the reactions needed for glycolysis
When comparing members of archaea with bacteria
A. archaea were the first organisms and were followed by bacteria. B. the chemical nature of the cell wall of archaea and bacteria is identical and shows their early relationship. C. bacteria are not very diverse and are limited in distribution while archaea are far more diverse and found everywhere. D. the archaea and bacteria are cases of reduction in traits and are both derived from early eukarya. E. None of the choices are true.
A newly described unicellular organism was isolated from a salt mine. This organism has no membranous organelles and its cell wall lacks peptidoglycan. Attempts to culture it in a medium with less than 25% salt were unsuccessful, but it was able to grow well on 25% salt supplemented agar. This organism would best be described as a ________ and is most likely in the domain ________.
A. halophile; Archaea. B. thermophile; Bacteria. C. halophile; Bacteria. D. thermophile; Archaea. E. thermophile; Eukarya.
A mutation in a gene often results in a reduction of the product of that gene. The term for this type of mutation is ________
A) gain of function B) loss of function or null (in the case of complete loss) C) codominance D) multiple allelism E) incomplete dominance