What is the probability of obtaining a head and a tail (in either order) when tossing a coin two times?
a. 1/2
b. 1/4
c. 1/8
d. 1/16
e. 1
ANSWER: a
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In vertebrates, the central nervous system develops directly from the ____
a. somites b. neural plate c. notochord d. cells of the neural crest e. neural tube
Which of the following is best observed by using a compound light microscope?
A. A eukaryotic cell B. a virus C. A DNA sequence D. The inner structure of a mitochondrion E. A nuclear pore
In E. coli, which enzyme catalyzes the elongation of a new DNA strand in the ? direction?
A) primase B) DNA ligase C) DNA polymerase III D) helicase
There are organisms that go through meiosis but do not undergo recombination when forming haploid gametes. Which of the following statements correctly describes the gametes produced by such an organism
(Assume that these organisms are diploid, that each of the two homologous chromosomes are genetically distinct as typically found in the wild, and that these organisms have more than one chromosome.) (a) All gametes formed during a single meiosis will be identical. (b) Due to the random assortment of homologs, each of the gametes formed during a single meiosis will be different. (c) This organism could potentially produce 2n genetically distinct gametes, where n is its haploid number of chromosomes. (d) The fusion of any two gametes produced by such an organism that does not undergo recombination during meiosis will create a cell that is genetically identical to that individual.