At the time of its discovery in 1938, the coelacanth was believed to have been extinct for 66 million years. Coelacanths are unusual fish by any measure; able to grow to the same size and weight as an adult human, live for fifty to sixty years, with eight lobed fins, an intracranial joint that allows it to open its jaw surprisingly wide, and a cranium filled with far more fatty tissue than brain, the coelacanth is frequently described as a living fossil, and reportedly tastes terrible. To which class does the coelacanth belong?
a. Myxini
b. Petromyzontida
c. Sarcopterygii
d. Actinopterygii
c. Sarcopterygii
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You are in biology lab examining plant root cells. You can still see chromosome strands, as they are in compact bundles. You conclude the cells are undergoing cytokinesis because you also observe the formation of the
A. cleavage furrow. B. cell plate. C. nucleolus. D. nuclear envelope. E. spindle fiber.
The hypodermis is composed of ____
blood vessels ? insulation oil glands ? insulation a. adipose and nervous tissues b. connective and adipose tissues c. blood and lymphatic vessels d. hair follicles and sweat glands e. sebaceous and sweat glands
Plants cannot ____ in the dark
a. grow b. respire c. move d. utilize chlorophyll e. sense light
Which disease affects the liver and could be transferred by an organ transplant?
A) hepatitis C B) diabetes C) gonorrhea D) tuberculosis