Which of these characteristics is NOT found in the amphibians?
A. two-chambered heart
B. small inefficient lungs
C. thin moist skin
D. eggs with gelatinous covering
E. aquatic larvae
Answer: A
You might also like to view...
On reaching the oocyte, a human sperm cell must pass through what layer(s) before it can fuse with the plasma membrane of the egg?
What will be an ideal response?
Influenza viruses A and B contain eight RNA strands and influenza virus C has seven strands. During antigenic drift, genes coding for glycoproteins recognized by the host immune system are mutated, whereas during antigenic shift, whole RNA strands can be swapped with those of another influenza virus, greatly increasing the virulence and transmissibility of the virus and minimizing the ability of the host's defenses to recognize it. Which of the following statements is true?
A. Genetic drift creates a need for an annual flu vaccine to keep up with the seasonal genetic changes, and if a genetic shift occurs, the same vaccine will be effective against both strains. B. The worst influenza pandemics throughout history have occurred as a result of genetic drift rather than genetic shift. C. Genetic drift creates a need for an annual flu vaccine to keep up with the seasonal genetic changes, and if genetic shift occurs, an additional vaccine will have to be administered since the shift creates a different strain of virus. D. If a novel strain resulting from antigenic shift appears, it is not necessary to get vaccinated because these strains are typically less pathogenic than seasonal strains.
Which respiratory structure is used to produce sound?
A. glottis B. larynx C. nose D. esophagus E. pharynx
The fleshy extension of the soft palate is known as the
A. pharynx. B. adenoid. C. uvula. D. epiglottis. E. cecum.