Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?
a) pdgf
b) mpf
c) protein kinase
d) cyclin
e) cdk

Asnail, elodea (aquatic plant), or both were added to the tubes and they were stoppered. tubes were placed under a grow light for 24 hours and the results recorded. the test tubes were then covered for 24 hours to produce a dark environment and the results recorded. which statement best explains the change in test tube d from the light setup to the dark setup.

Which process of living things produces water that enters the water cycle

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.