Which of the following statements about monosaccharide structure is true?
a. A six-carbon sugar is called a pentose.
b. Aldoses and ketoses differ in the position of their hydroxyl groups.
c. All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
d. Monosaccharides can be classified according to the spatial arrangement of their atoms
Ans: d. Monosaccharides can be classified according to the spatial arrangement of their atoms
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Researchers in Alaska were interested in increasing the sockeye salmon (Oncorhynchus nerka) population in three coastal lakes. To accomplish this, the ponds were treated with fertilizers. As a result, zooplankton biomass increased between 40% and 700% in the three lakes. The substantial growth in zooplankton would suggest that prior to these experiments, these lakes were __________________.
A. eutrophic B. stratified C. subject to low light levels D. oligotrophic
An operon is a useful genetic element, because it
A) encourages the binding of RNA polymerase. B) allows coordinated expression of multiple related genes in prokaryotes. C) translates DNA sequence into amino acid sequence. D) encourages the binding of ribosomes in the correct location.
What enzyme is responsible for replicating the ends of chromosomes in a eukaryotic cell?
a. DNA polymerase b. RNA polymerase c. primase d. telomerase
In comparing mitosis and meiosis, which statement is true?
a. Meiosis I is more like mitosis than is meiosis II. b. Both processes result in four cells. c. Pairing of homologues occurs in both. d. Chromatids are present only in mitosis. e. Meiosis II resembles mitosis.