The minus (-) ends of microtubules are often anchored at the ________________ , such that the dynamics associated with microtubules is at the plus (+) ends.
A) centriole
B) centrosome
C) plasma membrane
D) centromere
E) mitochondrial outer membrane
B) centrosome
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Which of the following is NOT part of the structure of the nucleosome core particle?
A. It is composed of an octamer of proteins. B. There is a linker region between two nucleosomes of about 200 base pairs. C. There are two copies each of H2A, H2B, H3 and H4. D. The DNA is wrapped around the core slightly over two complete turns E. The DNA wrapped around the core contains 146-147 base pairs.
Darwin studied the glyptodont and was intrigued by its similarities to the ________
a. horse b. cacti he discovered on the Galapagos Islands c. armadillo d. finches he discovered on the Galapagos Islands
The alcohol in beer and wine is from
fermentation by
a. bacteria. b. yeast. c. hops flowers. d. sugar. e. protistans
Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol _____
A) are structural isomers but have the same molecular formula B) are cis-trans isomers but have the same molecular formula C) have different functional groups attached to the same carbon skeleton D) are enantiomers of the same organic molecule