The cells of cnidarians use relatively little energy, so their demand for oxygen is quite low. They deliver oxygen to their internal cells by pumping water into and out of a central chamber called the ________

Fill in the blank(s) with correct word


gastrovascular cavity

Biology & Microbiology

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The concept that a set of three nucleotides specifies a particular amino acid provides the basis for

A) the one-gene-one-enzyme hypothesis. B) the one-gene-one-polypeptide hypothesis. C) the genetic code. D) biochemical reactions among nucleic acids. E) All of these

Biology & Microbiology

The portion of the bone labeled I in the accompanying figure is called the:a

periosteum. b. lacunae. c. epiphysis. d. osteon. e. metaphysis

Biology & Microbiology

The ____ in the diagram above is a tertiary consumer. 



A. spider
B. frog
C. fish
D. human

Biology & Microbiology

Which of the following is a characteristic of the organism that causes malaria?

A) Unicellular B) Prokaryotic C) Multicellular D) Photosynthetic E) Viral

Biology & Microbiology