McClintock's transposable genetic element hypothesis was that the unstable mutant phenotype resulted when a ________ created a mutation by its insertion into the ________ allele and led to reversion when the expression of ________ led to its
removal. Fill in the blank(s) with correct word
transposable element (Ds); C; Ac
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Sequencing eukaryotic genomes is more difficult than sequencing genomes of bacteria or archaea because of the _____
A) large size of eukaryotic proteins B) hard-to-find proteins C) high proportion of G-C base pairs in eukaryotic DNA D) large size of eukaryotic genomes and the large amount of eukaryotic repetitive DNA
How does a ribbon worm differ from a flatworm?
A. A flatworm has a complete digestive system. B. A ribbon worm has a mouth and an anus. C. Flatworms are deuterostomes. D. Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical.
A Ca2+-binding protein that activates many enzymes, including myosin light-chain kinase, is
A) Ca2+-ATPase. B) gelsolin. C) calmodulin. D) myosin light-chain phosphatase. E) TnC.
Fertilization by multiple sperm is blocked by
a. the exocytosis of secretory vesiclesthat coat the egg. b. a hardening of the plasma membrane. c. a hyperpolarization of the plasma membrane. d. the release of spermicidal jelly.