Plants use what form of nitrogen to make the building blocks for proteins and nucleic acids?
a. nitrogen gas
b. nucleic acids
c. ammonium
d. urea
e. nitrous oxide
ANSWER: c
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Which of the following is true about haplotypes?
A. Defining a haplotype requires the identification of simple-sequence repeats (SSR) and long repetitive sequences in the human population from multiple individuals. B. Single nucleotide polymorphisms (SNP) used to define the haplotype must be very close together on the chromosome. C. Mitochondrial haplotypes are less stable because mitochondrial DNA recombines at a high frequency. D. Haplotypes of the Y chromosome are not useful because only males have them. E. Haplotypes can be used as markers to trace human migration.
Botox is the marketed version of the botulism exotoxin, used to treat muscle spasms and for cosmetic purposes. Indicate whether the statement is true or false
Cytoplasmic division in animal cells involves _____.
A. formation of a cell plate B. formation of a deepening cleavage furrow C. the division of sister chromatids D. the formation of evenly spread cytoskeletal elements under the entire plasma membrane E. the synthesis of new spindle fibers
The phylum Euryarchaeota contains Archaea that can
a. utilize CO2 as a carbon source. b. grow at a pH of 0. c. use S0 as a terminal electron acceptor. d. all of the above.