The tissue that contracts to provide force is the _____ tissue.
Fill in the blank(s) with the appropriate word(s).
muscle
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The protein kinase activity of the receptor protein-tyrosine kinase is located ____
a. on the extracellular surface of the membrane b. on the cytoplasmic side of the cell membrane c. within the hydrophobic portion of the lipid bilayer d. in the nuclear membrane e. in the cystol
Male sticklebacks that see a model of a fish with a red belly will attack it, thinking it is a breeding male. They do not attack model fish without a red belly. This is an example of
A. learned behavior. B. imprinting. C. fixed action pattern. D. taxis. E. reflex.
Which of the following statements about the cytoskeleton is true?
A) The cytoskeleton of eukaryotes is a static structure most resembling scaffolding used at construction sites. B) Although microtubules are common within a cell, actin filaments are rarely found outside of the nucleus. C) Movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other. D) Chemicals that block the assembly of the cytoskeleton would have little effect on a cell's response to external stimuli. E) The cytoskeleton is produced by transport vesicles of the endomembrane system.
Which of the phyla of animals has the greatest number of species?
A. Arthropoda B. Chordata C. Mollusca D. Annelida E. Nematoda