How are receptor tyrosine kinases and steroid hormone receptors similar?
A. Both are activated by autophosphorylation
B. Both are transmembrane proteins with a single transmembrane domain
C. Both have a DNA-binding domain
D. Both have a site for binding ligand
D. Both have a site for binding ligand
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Where would you expect to find the Ca2+-activated form of gelsolin in cells crawling by amoeboid movement?
A) in and around focal adhesions B) at a pseudopodium tip where endoplasm is converting to ectoplasm C) at a pseudopodium base where ectoplasm is converting to endoplasm D) in the primary cilium E) at the cell trailing edge where force is produced to drive endoplasm forward streaming
An operon is a useful genetic element, because it
A) encourages the binding of RNA polymerase. B) allows coordinated expression of multiple related genes in prokaryotes. C) translates DNA sequence into amino acid sequence. D) encourages the binding of ribosomes in the correct location.
Altitude sickness
a. results from hypoxia. b. is characterized by hyperventilation. c. is characterized by headaches. d. is characterized by an accelerated heart rate. e. includes all of these.
Alkylating agents work to prevent the cell from replicating its genetic material, thus preventing cell division. At which checkpoint would the cell most likely stop?
A. M checkpoint B. S checkpoint C. G1Â checkpoint D. G2Â checkpoint