Attribute one of these statements to the blastopore.
A. it occurs in both protostomes and deuterostomes.
B. it can develop into the gut in some animals.
C. it can develop into the brain in some animals.
D. it is the opening from the archenteron to the coelom.
E. it is the opening from the coelom to the outside of the animal.
Answer: A
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Conjugation is useful for determining relatedness between bacteria at the species level because it never occurs between organisms of different genera.
Answer the following statement true (T) or false (F)
Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
The dominant vegetation of the temperate rain forest includes which of the following?
a. Sitka spruce b. western red oak c. beech d. bamboo e. Southern pine
Two categories of organic compounds typically provide energy for living systems. Representatives of these two classes are
A) lipids and proteins. B) carbohydrates and lipids. C) carbohydrates and nucleic acids. D) carbohydrates and proteins. E) proteins and nucleic acids.