The most serious teratogenic effects of intrauterine rubella infection occur if it is acquired during the third trimester.
Answer the following statement true (T) or false (F)
False
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Your brother has just purchased a new plastic model airplane. He places all the parts on the table in approximately the positions in which they will be located when the model is complete. His actions are analogous to which process in development?
A) morphogenesis B) determination C) induction D) differentiation E) pattern formation
Double fertilization occurs when
a. one sperm unites with an egg and another sperm unites with the central cell of the female gametophyte. b. two sperm unite with one egg. c. two sperm unite with the central cell. d. one sperm unites with the egg and another sperm unites with the male gametophyte. e. one sperm unites with the egg and another sperm unites with a pollen grain.
The stroma of the land-plant chloroplast is evolutionarily derived from __________
A. the thylakoid membrane B. the plasma membrane of cyanobacteria C. the periplasm of cyanobacteria D. the cytoplasm of cyanobacteria E. the plasma membrane of a eukaryotic ancestor
How many covalent bonds do noble gases form in nature?
a. Noble gases may form as many as three covalent bonds. b. Noble gases may form up to eight covalent bonds. c. Noble gases do not form covalent bonds with other atoms. d. Noble gases only form single bonds with other noble gases.