Which of the following is TRUE of a morphogen?
A. It is a signaling molecule required for cell-to-cell contact within the embryo.
B. It is a signaling molecule that induces the differentiation of cells within the embryo.
C. It is a signaling molecule that induces blastulation of the developing embryo.
D. It is a signaling molecule that induces implantation of the embryo into the uterus of mammals.
E. It is a signaling molecule that separates out cytoplasmic factors to their respective cells within the developing embryo.
B. It is a signaling molecule that induces the differentiation of cells within the embryo.
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What is the function of surfactant in the mammalian respiratory system?
A. reduction of surface tension in the fluid covering the alveoli B. capture and removal of inhaled foreign particles C. maintaining a moist surface D. transport of oxygen E. It functions as an antibiotic.
What accounts for carbon’s importance to life?
a. its ability to form rings b. its nonpolarity c. its versatile bonding behavior d. its ability to form rings e. its large size
Which of the following is a result of nonrandom mating within a population?
a. gene flow b. genetic drift c. adaptation d. inbreeding
Bodies which have a right half and a left half show ________ symmetry.
Fill in the blank(s) with the appropriate word(s).