Hemopoiesis begins early in embryonic development in the
A) bone marrow.
B) spleen.
C) lymphatic organs.
D) yolk sac.
Ans: D) yolk sac.
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How is DNA introduced into plants using the Ti plasmid?
a. The gene of interest remains in the Ti plasmid after the plasmid has transformed the plant, and the gene is expressed in the plant. b. The Ti plasmid inserts the gene of interest directly into the plant's nuclear DNA. c. The entire Ti plasmid including the gene of interest is inserted into the plant’s nuclear DNA. d. The Ti plasmid inserts the foreign DNA into the plant's chloroplast DNA. e. The Ti plasmid inserts the foreign DNA into the plant's mitochondrial DNA.
Why do frequent moderate intensity disturbances increase species richness?
What will be an ideal response?
Four of the five answers listed below are macronutrients. Select the exception
a. phosphorus b. sulfur c. nitrogen d. copper e. magnesium
A technique used in dating a rock can be used to accurately predict the age of the fossils occurring in the rocks. This technique involves
A. fossil dating. B. developmental geology. C. structural geology. D. radioactive isotope decay. E. successive rock layering.