In meiosis, chromosomes containing sister chromatids (not homologous chromosomes) align along the center of the cell during
a)prophase I.
b)prophase II.
c)interphase II.
d)metaphase I.
e)metaphase II.
e)metaphase II.
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Cells nearest the source of a morphogen are exposed to a high concentration of morphogen and express one set of genes. Cells farther from the source of the morphogen are exposed to a lower morphogen concentration, and express different genes. This is a description of which developmental process?
a. embryonic induction b. fertilization c. apoptosis d. cleavage e. gastrulation
Diagram a typical neuron, label its parts, and list the function of each labeled structu What will be an ideal response?
Cells divide because _______.
a) some single-celled species use cell division as a means of reproduction b) an organism needs to increase its number of cells in order to grow c) cells die and need to be replaced d) all of the above are correct
Glycolysis is an anaerobic process used to catabolize glucose. What does it mean for this process to be anaerobic?
(a) no oxygen is required (b) no oxidation occurs (c) it takes place in the lysosome (d) glucose is broken down by the addition of electrons