Human-to-human transmission of plague is usually by
A) rat flea.
B) dog flea.
C) the respiratory route.
D) wounds.
E) unsanitary conditions.
C
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Answer the following statements true (T) or false (F)
1. Phylogenetic analyses of some vertebrate mineralcorticoid and glucocorticoid receptors and their ligands has suggested that the hormones evolved prior to their receptors. 2. Vasotocin is present in non-mammalian vertebrates and shares structural and functional properties with mammalian antidiuretic hormone and oxytocin. Through these similarities it has been suggested that vasotocin could be the ancestral precursor to the posterior pituitary hormone in vertebrates. 3. Vitamin D is a hormone produced in part by exposure to sunlight. 4.
For two genes on different chromosomes, the inheritance of one gene does not influence the chance of inheriting the other gene. This is called
A) The law of independent assortment B) The law of segregation C) The mode of inheritance D) A monohybrid cross
The difference between simple diffusion and facilitated diffusion is that facilitated diffusion
A) Can move materials from a higher to a lower concentration. B) Can move materials from a lower to a higher concentration. C) Requires ATP. D) Requires transporter proteins. E) Doesn't require ATP.
Which of the following types of microscopes provides a 3-dimensional image of the surface of cells and viruses?
A. Transmission electron microscope B. Scanning electron microscope C. Brightfield microscope D. Darkfield microscope