Which phylum is a member of the Radiata clade?

a. Nemertea
b. Porifera
c. Rotifera
d. Ctenophora
e. Echinodermata


ANSWER: d

Biology & Microbiology

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Which of the following is NOT true regarding bone repair?

A) immediately after breaking a bone, a hematoma forms as blood clots in the injured area B) Osteoblasts convert cartilage to bone in the injured area. C) a callus of fibrocartilage forms to hold the two broken ends of the bone together D) bones heal more quickly as an individual ages

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In a growing population, the youngest age classes have

A. the highest number of deaths/year. B. the fewest individuals. C. the most individuals. D. the smallest number of deaths/year. E. the most individuals and the largest number of deaths/year.

Biology & Microbiology

Walking through the botanical garden with a friend, you spy a rare and beautiful variety of Hosta. "Oh I would love to have one of those!" you exclaim. "But they cost a king's ransom." Your friend smiles, snips off a tiny piece of the shoot, and says, "I'll grow you one. I'll just take it back to lab and..." 

Ranking Questions __  "wait for somatic embryos to form..." __  "grow up a callus..." __  "culture an individual plantlet for you..." __  "use enzymes to break down the cell walls..."

Biology & Microbiology

During embryonic development, animal cells must divide and differentiation to determine what?

a. morphology and anatomy b. anatomy and physiology c. morphology and physiology d. analogy and homology

Biology & Microbiology