Some energy gets stored in molecules that most consumers cannot break down. For example, most carnivores cannot access energy tied up in bones, scales, hair, feathers, or fur. What effect does this have?
a. More energy is lost through heat by the energy needed for digestion.
b. Energy transfer between trophic levels is efficient.
c. It increases the need for many trophic levels.
d. Only a small percent of the energy in an organism ends up in tissues of an organism at the next trophic level.
e. Second-level consumers do not require as much energy.
d
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How do marine polychaetes use chitin hardened body parts?
a. as an excretory organ b. the chitin hardened tentacles, to move sand c. to chew and digest prey d. the chitin-hardened jaws, to capture prey e. the chitin-reinforced bristles, for movement and chitin hardened jaws to capture prey
In the ABO blood-type system, which genotypes could confer type A blood to a person?
What will be an ideal response?
The phenomenon where the level of gene expression is controlled so that genes can be expressed at high or low levels is called gene __________.
Fill in the blank(s) with the appropriate word(s).
Answer the following questions true (T) or false (F)
1. Tiny holes that are channels between animal cells are called gap junctions. 2. The hydrophilic region of the phospholipid bilayer faces to the interior of the plasma membrane. 3. In cystic fibrosis, cells cannot pump out enough chloride ions.