Endemic murine typhus is transmitted by
a) Xenopsylla cheopis.
b) Ixodes spp.
c) Dermacentor variabilis.
d) Pediculus humanus corporis.
Ans: a) Xenopsylla cheopis.
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Mendel's work with monohybrid crosses provided proof of which of the following?
A. Blending theory of inheritance B. Particulate theory of inheritance C. Chromosomal theory of inheritance D. Pangenesis E. None of the answers are correct
Invasive Eurasian grass species can outcompete native North American grasses through
A. secretion of allelochemicals. B. producing more viable seeds. C. producing seeds year-round. D. avoiding grazing animals. E. faster seed germination.
Much of our understanding of how large organisms respond to environmental variation is based on
using model species.
Indicate whether the statement is true or false.Which of the following glands is considered to be the master gland of the body?
a. hypothalamus b. adrenal gland c. pituitary gland d. thyroid gland e. parathyroid gland