What is the primary advantage of four-chambered hearts possessed by mammals over the hearts of reptiles and amphibians?
a. Larger hearts allow mammals to warm their blood more efficiently, which expands the habitat range available to them.
b. An extra ventricle allows the heart to continue functioning in case any other chamber of the heart fails.
c. Fully separated ventricles prevent partial deoxygenation of blood in the heart, allowing more oxygen to reach remote tissues.
d. Larger hearts accommodate nucleated red blood cells unique to mammals, which are larger and contain more hemoglobin
c. Fully separated ventricles prevent partial deoxygenation of blood in the heart, allowing more oxygen to reach remote tissues.
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A recently isolated bacterial strain has been given to you for general characterization of the genome. You begin by isolating the DNA and subjecting it to thermal denaturation. You use Escherichia coli DNA as a reference (A + T = G + C).
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Based on the information in the graph, you can determine that the DNA has a high
A) G-C content with respect to E. coli.
B) pyrimidine content with respect to E. coli.
C) A-T content with respect to E. coli.
D) purine content, with respect to E. coli.
E) none of the above
Members of the phylum ____ exhibit radial symmetry, with their body parts arranged regularly around
a central axis.
a. Porifera b. Mollusca c. Cnidaria d. Platyhelminthes e. Chordata
Pinocytosis would allow the intake of
A. solid food. B. gas. C. molecules dissolved in water. D. All of these answers are true.
An unknown bacterial species is recovered from a sick patient's digestive tract. It has a membrane outside the cell wall that contains toxic lipids. This observation indicates that
A) the infection should be relatively easy to control with common antibiotics, because the pathogen is a gram-positive species. B) the infection should be relatively easy to control with common antibiotics, because the pathogen is a gram-negative species. C) the infection may be quite threatening and difficult to control, because the pathogen is a gram-positive species. D) the infection may be quite threatening and difficult to control, because the pathogen is a gram-negative species.