Major evolutionary changes have resulted in anatomical and physiological adaptations that optimize the rate of gas exchange in animals by each of these factors except ________.
A. decreasing the distance for diffusion
B. increasing the diffusion constant for each gas
C. increasing the surface area for diffusion
D. increasing the concentration difference driving diffusion
B. increasing the diffusion constant for each gas
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Immunization against endemic diseases is NOT necessary when traveling outside of one's home country or region
Indicate whether the statement is true or false.
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.
Which component in the cell membrane restricts the passage of water-soluble substances?
a. sterols b. phospholipid c. protein d. glycolipids
Which complementary base pairings occur between DNA and RNA?
A) A to T and C to G B) T to C and A to G C) G to C and A to U D) C to U and A to T