Who developed the modern endosymbiotic theory?

a. Charles Darwin
b. Lynn Margulis
c. Richard Dickerson
d. Wendy Johnson
e. Stanley Miller


ANSWER: b

Biology & Microbiology

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The earliest primates were:a

knuckle walkers. b. bipedal. c. brachiate. d. quadrupedal. e. arbore

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_____ bonds link the sugar and phosphate groups in the backbones of DNA molecules

a. Covalent phosphodiester

b. Hydrogen c. Weak d. Ionic e. Weak covalent

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There has been a lot of discussion about stem cell research in mainstream literature (i.e., newspapers and magazines). Stem c ells come from all of the following except:

a) umbilical cord b)embryos c) bone marrow d) Stem cells can come from all of these sources

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The t-stat, a specific instance of a test statistic, is used to evaluate a null hypothesis concerning which population parameter of a random variable?

A. The size of the sample B. The variance C. The mean D. The r-squared

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