To what class does the Eastern Gray Squirrel belong?
A. Mammalia
B. Amphibia
C. Aves
D. Chondrichthyes
Answer: A
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Which of the following is not true of oligonucleotide-directed mutagenesis?
A. Two complementary oligonucleotides, each identical in sequence to the cloned gene, are annealed to the opposite strands of the cloned gene. B. Two complementary oligonucleotides, each with the desired base change, are annealed to the opposite strands of the cloned gene. C. After repeated cycles of PCR, the mutation containing DNA predominates in the population. D. Nonmutant template plasmid DNA can be selectively eliminated by cleavage of the methylated template strand. E. The two annealed mutant DNA strands serve as primers of DNA synthesis in both directions around the plasmid vectors.
Because of the low penetration power of electrons, samples for transmission electron microscopy must be extremely thin. A(n) ________ is able to cut sections as thin as 20 nm.
Fill in the blank(s) with the appropriate word(s).
Genetic material, DNA and RNA, are found in three distinct organelles in eukaryotic cells, what are these organelles and which type of relationship may have lead to their formation?
A. Chloroplast, mitochondria, nucleus, endosymbiotic. B. Chloroplast, lysosomes, nucleus, endosymbiotic. C. Nucleus, Golgi body, endoplasmic reticulum, symbiotic. D. Mitochondria, chloroplast, nucleus, parasitic. E. Lysosomes, mitochondria, chloroplast, parasitic.
Which of the following scientists proposed that geologic change occurred gradually due to small changes accumulating over long periods of time?
A. Georges-Louis Leclerc B. Erasmus Darwin C. Jean-Baptist's Lamarack D. James Hutton