Which of the following statements is false?
a. The tissues of arthropods are bathed with hemolymph, which delivers oxygen to their cells.
b. In an open circulatory system the heart is still responsible for pumping oxygen-rich fluid.
c. Earthworms have a central heart that pumps blood to all their tissues.
d. Blood vessels are found in the open circulatory systems common to some invertebrates.
e. Hemocyanin is the oxygen transport pigment found in the open circulatory system of invertebrates.
c
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You are in a lab studying a new cell type that has been discovered. You observe a rigid cytoskeleton in this cell, along with a nucleus and a compartmentalized interior. How would you classify this cell?
A. as an advanced prokaryotic cell, because it has a rigid cytoskeleton B. as a primitive prokaryotic cell C. as a possible transitional cell from prokaryotic to eukaryotic D. as a eukaryotic cell that has to be heterotrophic E. None of the answers options is correct.
All of the following occur in both DNA and RNA EXCEPT
a. four nitrogenous bases. b. a phosphate–sugar backbone. c. a double-stranded molecule. d. All of these are found in both DNA and RNA
If an individual for whatever reason cannot pass on
its genes to offspring, the best alternative is to show altruism to a. relatives. b. strangers. c. neighbors. d. other species. e. competitors.
Which of the following does NOT occur during prophase I of meiosis?
A. synapsis B. crossing-over C. independent assortment D. nuclear membrane disappears