During embryo development, the origin of muscle tissue is from the
A. endoderm.
B. ectoderm.
C. ectoderm or endoderm.
D. mesoderm or ectoderm.
E. mesoderm.
E. mesoderm.
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The release of neurotransmitter from the presynaptic cell is an example of:
A. phagocytosis. B. endocytosis. C. transcytosis. D. exocytosis.
Sex chromosomes are
a. completely different between the two sexes. b. partially homologous but also have unique regions. c. found only in males. d. unable to line up properly at the metaphase plate. e. completely homologous but always have different alleles.
Which of the following is incorrect concerning a
nerve net? It a. is found in animals with radial symmetry. b. is responsive to information arriving from any direction. c. shows evolution of cephalization. d. controls cells with contractile properties. e. receives information from sensory cells.
Your house plant is growing slowly and lacks its normal bright green color, so you call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is a cofactor for NADPH function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.