Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Why would the virus form a cold sore?
a. To allow it to spread to a new host
b. So that it can mutate and survive an antibiotic treatments
c. To move to another part of the body
d. To avoid the immune system
e. To warn other people that the host is infected
a. To allow it to spread to a new host
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Which animal cell organelle contains enzymes that transfer hydrogen from various substrates to oxygen?
A) lysosome B) vacuole C) mitochondrion D) Golgi apparatus E) peroxisome
Binding of one oxygen molecule to hemoglobin facilitates binding of the next two molecules; thus oxygen binding shows positive _______.
Fill in the blank(s) with the appropriate word(s).
The type of body symmetry in which any plane passing through the body from the mouth to the opposite end divides the body into mirror images is
A. longitudinal symmetry. B. mirrored symmetry. C. bilateral symmetry. D. radial symmetry. E. asymmetry.
The autosomal dominant disorder neurofibromatosis Type I (NF1) causes benign tumors in individuals who have the NF1 allele (N). Nearly every individual who is either NN or Nn will show some clinical symptoms of the disorder yet individuals can have widely different symptoms with some individuals being severely affected while others have few tumors. Based on this description, NF1 appears to have ______________.
a) incomplete dominance b) variable expressivity c) incomplete penetrance d) pleiotropy