According to a 2003 study performed by Michelle Khan and her coworkers, the rate of cervical cancer appears to be
the greatest when women are ____.
a. positive for HPV 16
b. negative for HPV16 but positive for HPV18
c. negative for HPV16/18 but positive for other cancer-causing HPV
d. negative for all cancer-causing HPV
e. positive for HIV
ANSWER: a
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Which one of the following terms applies to the phylum Platyhelminthes?
A. radial cleavage B. protostome C. diploblastic D. acoelomate E. radial symmetry
The inner mitochondrial membrane contains numerous inward folds called cristae, which greatly increase the surface area of this membrane. Because ATP is produced on the inner mitochondrial membrane, cristae enhance the ability of the mitochondria to generate ATP. What structure can be thought of as similar to these cristae?
A. Spiracle B. Finger-like projections of a human's small intestine C. Bronchiole D. Cartilage
Answer the following statements true (T) or false (F)
1. The fast block to polyspermy occurs through a rapid increase in cytosolic calcium within the egg. 2. The sperm and its DNA enters the egg through simple diffusion through the egg plasma membrane. 3. The cortical reaction prevents multiple sperm from contributing their chromosomes to the egg. 4. The endoderm is a germ cell layer that tends to cover the embryo.
One form of hereditary blindness is inherited through a mutation in mitochondrial genes. Which of the following is a CORRECT statement about this condition?
a) Only females can have the condition. b) Only males can have the condition. c) Males who have the condition inherited it only through their mothers. d) Males can not have the condition.