Which of the following is necessary for strong bones and teeth, nerve conduction, muscle contraction, and blood clotting?

A. sodium
B. sulfur
C. iron
D. magnesium
E. calcium


Answer: E

Biology & Microbiology

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Which of the following statements best describes the Hox genes of the different groups of animals?

A. All animals have Hox genes. B. Invertebrate chordates have one cluster of Hox genes. C. Gnathostomes have four clusters of Hox genes. D. Hox genes are involved with the evolution of structural complexity. E. All the choices provided are correct.

Biology & Microbiology

Among the types of microorganisms, the ________ are noncellular.

A. protozoans B. bacteria C. helminths D. viruses

Biology & Microbiology

In a competitive interaction in which species 1 has a higher carrying capacity (K1 ) than species 2 (K2 ), it is expected that species ________ will go extinct

Fill in the blank(s) with correct word

Biology & Microbiology

The structure in the eye that focuses light onto photoreceptors is the ____

a. sclera b. pupil c. iris d. lens e. ciliary muscle

Biology & Microbiology