What group has a water vascular system, moves with tube feet, and has an endoskeleton?
A. arachnids
B. echinoderms
C. crustaceans
D. mandibulates
Answer: B
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Spontaneous mutation occurs when
A) a DNA base is in an unstable tautomeric form as the replication fork arrives and a mismatched base is inserted. B) a person smokes cigarettes or is exposed to a teratogen for many years. C) the sugars and phosphates in the DNA double helix exchange places. D) thymine temporarily becomes uracil.
A quantitative trait influenced by four loci, each with two alleles, would be expected to show ________ possible genotypes
A) 81 B) 16 C) 8 D) 256 E) None of these
What are the smallest projections of the small intestine wall?
A. Microvilli B. Cilia C. Villi D. Brush border cells E. Duodena
A person carrying one gene for sickle-cell hemoglobin will be resistant to Plasmodium infection.
Answer the following statement true (T) or false (F)