Megaplanktonic molluscs without a shell are called:
a. cephalopods.
b. thecosome pteropods.
c. gymnosome pteropods.
d. nudibranchs.
e. oceanic limpets.
C
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Pentameric IgM activates complement up to 20-fold more effectively than does the hexameric form of IgM.
Answer the following statement true (T) or false (F)
Why do species with large body sizes typically have lower population densities?
a. each large organism consumes more available resources b. there are not enough individuals to grow the population c. genetic diversity is low d. small organisms have more potential mates e. large organisms do not like living near one another
Golden rice was genetically engineered to
a. produce vitamin B12. b. produce vitamin A. c. bind minute gold molecules. d. grow twice as fast as normal rice. e. do all of these.
In this type of prenatal diagnosis, karyotype analysis can be performed as early as 8 weeks
A. Amniocentesis D. Pre-genetic diagnosis B. Chorionic villus sampling E. Polyploid analysis C. Cell-free fetal DNA analysis