Which division of meiosis reduces the number of chromosomes by half?
a. meiosis I
b. meiosis II
c. both meiosis I and meiosis II
d. neither meiosis I or meiosis II
Answer: a. meiosis I
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Which of the vertebrates senses is the least well understood?
A. electroreception B. magnetoreception C. vision D. hearing E. touch
What mechanism used for mobilization of transposable elements can lead to deletions in genomes?
A) Transposase sometimes deletes genomic DNA while removing DNA transposons from the genome. B) Alignment of two transposable elements is required for mobilization and misalignment can result in deletions. C) RNA polymerase transcribes transposable elements; when it makes mistakes, DNA nucleotides are sometimes deleted. D) Piwi RNAs inhibit movement of transposons by deleting DNA that includes and surrounds the inverted repeats.
Which of the following correctly lists the levels of biological organization?
1.tissue, cell, organ, organ system, organism 2.cell, organ, tissue, organ system, organism 3.cell, tissue, organ, organ system, organism 4.cell, tissue, organ system, organ, organism
The technique that separates DNA fragments of different lengths by applying a charge is known as
A. shotgun sequencing. B. Southern blotting. C. transformation. D. gel electrophoresis.