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

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

In what part of the body does the most muscle activity happen?

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.