Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated.
B) acetylated.
C) doubly phosphorylated.
D) doubly methylated.
E) cleaved by proteases.
Answer: A
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Answer the following statement true (T) or false (F)
According to the text, ____ major mass
extinction(s) and recovery(ies) has(have) taken place in the past. a. 1 b. 2 c. 3 d. 4 e. 5
Match the motor molecule to its function
A) processive movement toward microtubule plus end B) movement along microtubule toward its minus end C) processive movement toward actin filament plus end D) generates force on actin filaments in a sarcomere E) generates force for sliding of flagellar microtubules 1) cytoplasmic dynein 2) axonemal dynein 3) kinesin 4) myosin V dimer 5) myosin II filament
Singer and Nicolson's fluid mosaic model of the membrane proposed that membranes_____
A) are a phospholipid bilayer between two layers of hydrophilic proteins B) are a single layer of phospholipids and proteins C) consist of protein molecules embedded in a fluid bilayer of phospholipids D) consist of a mosaic of polysaccharides and proteins