During S phase ((A)_______), neuronal progenitor cells in the neural tube will be localized at the (B)________.
a. (A) mitotic stage (B) ventricular zone
b. (A) mitotic stage (B) marginal zone
c. (A) DNA synthesis stage (B) ventricular zone
d. (A) DNA synthesis stage (B) marginal zone
Answer: d. (A) DNA synthesis stage (B) marginal zone
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The species richness of trees can be predicted by
A. the time hypothesis. B. species-area effect. C. patterns of smaller insects. D. the evapotranspiration rate. E. the species-area effect.
Which of the following is the specialized junction between neurons where signals pass between them?
a. node of Ravier b. axon hillock c. synapse d. dendrite
Which structure becomes part of the placenta?
a. chorion b. amnion c. blastocoel d. yolk sac e. allantois
The first plants evolved rapidly during the __________ period
a. Devonian b. Silurian c. Carboniferous d. Triassic e. Ordovician