How does an open circulatory system differ from a closed one?
A. The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels.
B. A closed circulatory system is completely encased in the body cavity whereas the open one is not.
C. An open circulatory system opens into the heart whereas the closed circulatory system does not.
D. An open circulatory system opens into arteries and is drained by veins whereas in a closed one it is just the reverse.
E. An open circulatory system drains into the mantle cavity whereas a closed circulatory system drains into the hemolymph.
A. The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels.
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The binding of _______________ to the Lac repressor causes the protein to dissociate from the operator
A. lactose B. glucose C. fructose D. allolactose
DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar. B) RNA is made up five bases, whereas DNA is made up of four. C) RNA cannot exist as a double helix. D) in general, RNA molecules are longer than DNA molecules. E) all of the above
A second level consumer is indicated by
a. A. b. B. c. C. d. D. e. E.
What is the major difference in the termination stage of translation between prokaryotes and eukaryotes?
A. There are two termination factors in prokaryotes (RF1 and RF2) and only one factor in eukaryotes (eRF). B. There is no stop codon in prokaryotes while a stop codon is necessary in eukaryotes. C. Ribosomal subunits dissociate in prokaryotes, but remain intact in eukaryotes. D. There is one stop codon in prokaryotes (UAG) and three in eukaryotes (UAA, UAG, UGA). E. mRNA remains connected to the small ribosomal subunit (30S) in prokaryotes, but is released from the small ribosomal subunit (40S) in eukaryotes.