Which of the following is a peptide hormone?
a. adrenaline
b. ACTH
c. progesterone
d. melatonin
e. prostaglandin
b
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Which of the following cell types can become the meristematic cells of a vascular cambium? Select all correct choices
A. shoot apical meristem cells B. procambial cells C. epidermal cells D. parenchymal cells
N-acetylglucosamine is a repeating disaccharide found in the extracellular matrix.
a. true b. false
The portion of the cell cycle when the cell is growing and does not contain a replicated genome is referred to as:
A. Cytokinesis B. Mitosis C. S D. G1 E. G2
The key differences between cell types that allows them to be differentiated from one another are ________, the result ofÂ
A. the rate of gene expression in different cell types; varying density of RNA polymerase to produce more mRNA in some cells than others. B. the amount of protein present in different cell types; varying density of ribosomes to produce more polypeptides in some cells than others. C. the proteins being produced in each cell type; transcription factors regulating which genes are expressed and their level of expression. D. the DNA present in the nucleus of each cell type; differential sorting of chromosomes during mitosis when the cells are dividing.