A cooperative effect often occurs in multi-subunit proteins, leading to improved function of the subunits when bound to each other
A. true
B. false
Answer: A
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Individual water molecules are held to one another by relatively weak ________ bonds.
A. nonpolar B. hydrogen C. ionic D. covalent
The primer for retrovirus reverse transcription is a specific
A) tRNA encoded by the cell. B) tRNA encoded by the virus. C) nuclear tRNA. D) nuclear tDNA.
Which type of RNA is not involved in protein synthesis?
1.MicroRNA 2.Ribosomal RNA 3.Transfer RNA 4.Messenger RNA
Place the following events of the acrosomal reaction in the correct chronological order.(1) The acrosome releases hydrolytic enzymes.(2) Sperm-binding proteins on the membrane bind the sperm.(3) Sperm nucleus enters the egg.(4) Sperm and egg plasma membranes fuse.(5) Sperm contacts the egg's jelly coat.
A. 5,1,2,4,3 B. 5,2,4,3,1 C. 1,5,4,3,2 D. 3,5,2,1,4 E. 1,2,4,3,5