Which extra-embryonic membrane gives rise to blood vessels in the umbilical cord?


Answer: Allantois

Biology & Microbiology

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Which of the following molecules would not readily cross an intact cell membrane by simple diffusion?

A) water B) glucose C) oxygen D) fatty acids E) ethanol

Biology & Microbiology

Over the past 100 years, the decrease in deaths due to infectious disease has been somewhat offset by an increase in death due to metabolic diseases.

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

Biology & Microbiology

Marine reptiles eliminate excess NaCl by means of _____________ located near the nose or the eye.  

A.  Malpighian tubules B.  antennal glands C.  salt glands D.  protonephridia E.  nephrons

Biology & Microbiology

Which organism has hemoglobin located in the fluid portion of the blood, giving it a red appearance?

A. grasshopper B. bird C. flatworm D. human E. earthworm

Biology & Microbiology