Why does meiosis in females produce only one viable gamete while meiosis in males produces four? What will be an ideal response?
After fertilization, the female is obligated to provide all the metabolic machinery for the zygote. As a
result, the egg needs a large cytoplasmic mass to retain and support all the necessary organelles. The
male gamete merely delivers its chromosome content, and thus can survive on a small cytoplasmic
volume.
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What name is given to the food-trapping cells of sponges?
A) cnidocytes B) amoebocytes C) skeletal fibers D) choanocytes
The gain of electrons by a molecule is called
a. inhibition b. entropy c. oxidation d. reduction
Describe the pathogenesis of HIV to explain how the number of CD4 lymphocytes decline in an ongoing HIV infection
What will be an ideal response?
An egg of the organism of S. mansoni is isolated from the feces of an adult man who has been traveling in Africa. An unoperculated egg with a large lateral spine is recovered. The patient is administered the standard dose of praziquantel; however, his infection does not improve. Which one of the following statements explains this discrepancy?
a. Metrifonate should have been adminis-tered. b. Bilarcil is the drug of choice for this type of infection. c. Steroids should have been initially admi-nistered. d. A larger dose may be required to be effec-tive against this organism.