stage of cellular development that occurs after division of a stem cell and before the cell becomes a fully differentiated cell
What will be an ideal response?
progenitor cell
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Which of the following is a reversible post-translational covalent modification?
A. phosphorylation B. acetylation C. disulfide bond formation D. phosphorylation and acetylation E. acetylation and disulfide bond formation
A tracheid is
A. a gametophyte cell. B. a small branch of an insect trachea. C. a seed-bearing stem. D. a specialized vascular cell. E. a reproductive chamber.
In DNA replication, a primer is
a. what the original DNA strands are called. b. an enzyme that breaks the hydrogen bonds between base pairs. c. a short piece of nucleic acid that ‘jump starts’ the replication process. d. a molecule that provides the energy for nucleotide attachments. e. a regulatory protein that turns on the gene that starts DNA replication
Which of the following is delivered from the small intestine to the bloodstream through the lymphatic system?
A) Amino acids B) Proteins C) Lipids (fats) D) Carbohydrates (sugars)