The rungs of the DNA ladder are formed by base pairs
a. joined by covalent bonds.
b. joined by hydrogen bonds.
c. joined by ionic bonds.
d. NOT joined to each other
Answer: b. joined by hydrogen bonds.
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The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at
metaphase I. How many OTHER possible arrangements exist?
a. none b. one c. two d. seven e. eight
One problem with eradicating invasive species is that sometimes the disturbed area is unable to be colonized by native species
For example, in forests where the invasive plant garlic mustard has been removed, native plants and animals do not recolonize because they are extinct in that patch of forest. How should restoration ecologists increase species diversity and recover ecosystem function? A) Introduce tertiary consumers. B) Develop movement corridors for primary producers. C) Develop movement corridors for species with similar niches. D) Eliminate keystone species.
The largest molecule of the following is
A. glucose. B. a polysaccharide. C. a disaccharide. D. sucrose. E. a monosaccharide.
The phylum Planctomycetes contains a number of species that have compartments including ALL of the following EXCEPT
a. a magnetosome. b. a pirellulosome. c. a nucleoid with a nuclear envelope. d. an anammoxosome.