Which of the following bonds is weakest?
a. ionic
b. single covalent
c. polar covalent
d. nonpolar covalent
e. hydrogen
E
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Beadle and Tatum discovered that metabolic pathways are studied most effectively using which of the following techniques?
A) creating multiple gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway B) adding intermediates to a metabolic pathway C) removing all intermediates of a metabolic pathway D) creating single gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway
Homologous genes within a species are called paralogs
Indicate whether the statement is true or false
The microtubule-organizing center (MTOC)
A) serves as a site for microtubule and microfilament assembly. B) acts as an anchor for both ends of the microtubule. C) is associated with two centrioles in plant cells. D) is called a centrosome during interphase. E) is positioned near the cell membrane.
All of the following have radial cleavage patterns
EXCEPT a. snails. b. squids. c. earthworms. d. sea stars. e. insects.