During enzyme-linked reception, signal molecules bind to two tyrosine kinase receptors. The receptor proteins move
closer together in the plasma membrane and pair, forming a(n) ____.
a. gate
b. dimer
c. pathway
d. polypeptide chain
e. protein kinase cascade
b
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Which of the following is one of the big differences between eukaryotic and prokaryotic DNA replication?
a. Helicase is not used by eukaryotes. b. There is no topoisomerase found in eukaryotic cells. c. In eukaryotic DNA replication, histones must be removed. d. Only eukaryotes have Okazaki fragments to be ligated.
Choanocytes are a characteristic of members of the phylum Cnidaria
____________________ Indicate whether the statement is true or false.
Which organ system does NOT play a role in acquiring materials and energy?
A. digestive B. skeletal C. muscular D. cardiovascular
A pluripotent cell _________
(a) can only be produced in the laboratory. (b) can give rise to all the tissues and cell types in the body. (c) can only give rise to stem cells. (d) is considered to be terminally differentiated.