Which of the following is NOT an example of a theory?
a) species evolve through natural selection
b) molecules are composed of atoms
c) organisms are composed of cells
d) diseases are caused by germs
e) all of the above are considered to be theories
Answer: e) all of the above are considered to be theories
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What type of sensory receptor is responsible for olfaction?
A. photoreceptor B. electroreceptor C. chemoreceptor D. nociceptor
Which of the following is not true of influenza?
A. H5N1 is the bird flu strain that may cause a pandemic. B. Influenza B viruses undergo both antigenic drift and antigenic shift. C. Antigenic drift changes the antigens to reduce immune recognition. D. Antigenic shift causes changes in the RNA strands. E. Influenza has glycoprotein spikes of hemagglutinin (H) and neuraminidase (N).
In humans, the gene for blood type has ____________________ (number) alleles and the A and B alleles are
____________________. Fill in the blank(s) with the appropriate word(s).
A mutation in mice leads to overgrowth of the Sertoli cells, so they span across the diameter of the seminiferous tubules. What phenotype would you expect to see?
A. infertility due to lack of mature sperm entering the epididymis B. infertility due to lack of mature oocytes C. overproduction of sperm, so they clog the bulbourethral gland D. overproduction of testosterone