Evolutionarily, floral parts represent modified
A. stolons.
B. stems.
C. buds.
D. roots.
E. leaves.
Answer: E
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Suppose the protein specified by bicoid was injected into Drosophila embryos, so that a high concentration was present everywhere in the embryo. What might be the result of such an experiment?
A) The embryos would grow larger than normal. B) The embryos would show no development of posterior regions. C) The embryos would show no development of anterior regions. D) The embryos would halt their development.
The developing embryo implants into the uterine lining at about five days after fertilization. At this stage, it is a fluid-filled ball of cells called a ____
Fill in the blank with the appropriate word.
The slime layer external to the prokaryotic cell wall is called the ____
a. glycocalyx b. extracellular matrix c. plasma membrane d. pilus e. flagellum
Glycogen can be used as an energy source in the body; what is glycogen made of?
a. lipids b. amino acids c. glucose d. nucleic acids