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

Biology & Microbiology

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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

Biology & Microbiology

What are the smallest projections of the small intestine wall?

A. Microvilli B. Cilia C. Villi D. Brush border cells E. Duodena

Biology & Microbiology

A person carrying one gene for sickle-cell hemoglobin will be resistant to Plasmodium infection.

Answer the following statement true (T) or false (F)

Biology & Microbiology

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.

Biology & Microbiology