Microvilli which line down the luminal surface of those epithelial cells represent the resorptive function of the proximal tubule. 
<span>The high quantity of mitochondria inside the epithelial cells of the proximal convoluted tubule is needed in order to supply the energy for the active transport of sodium ions (to enter the cell from the luminal side).</span>
        
                    
             
        
        
        
Answer: C. DNA polymerase joins nucleotides in one direction (5' to 3') 
Explanation: DNA polymerase joins nucleotides in one direction (3' to 5') 
 
        
             
        
        
        
Answer: Cuvier
Explanation: Cuvier would be the correct answer plz mark brainliest have a nice day
 
        
             
        
        
        
For full activation of a cyclin-CDK complex, an enzyme called CDK-activating kinase must phosphorylate an amino acid near the CDK active site.
CDK-activating kinase (CAK) actuates the cyclin-CDK complex by phosphorylation of an amino acid i.e. threonine residue 160 near the CDK active site.
CAK is a member of the CDK family and serves as a positive regulator of CDK1, CDK2, CDK4, as well as CDK6.
CDK activation needs two steps. Primarily, the cyclin should attach to the CDK and secondly, CAK should phosphorylate the cyclin-CDK complex on the threonine residue 160, that is situated in the CDK activation section. 
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