Mutants of Drosophila melanogaster have been used extensively to explore the genetic control of early development,x
particularly the hierarchical control of development, which
means that genes expressed at each stage control the expression of genes that act later.
A. true
B. false
A
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Phagocytosis leads to destruction of engulfed pathogens by which of the following mechanisms?
A. Complement fixation B. Lysosomal-mediated hydrolysis C. Production of bacteriocins D. All of the choices are correct.
In lactation, milk production is stimulated by _____, while milk release is stimulated by _________.
A. oxytocin, prolactin B. progesterone, oxytocin C. prolactin, oxytocin D. prostaglandin, oxytocin E. progesterone, prolactin
The measurement of the temperature of a substance
is directly related to a. the nature of its chemical bonds. b. its reactivity. c. its thermal conductivity. d. the motion of its molecules. e. the mass of its molecules.
The pigment that absorbs light energy (photons) in photosynthesis is
A) rubisco. B) chlorophyll. C) PEP. D) CAM.