Which of the following is true regarding some insect tracheal systems?
A. They are associated with the blood circulatory system.
B. They excrete body wastes as well as transport gases.
C. Their spiracles function like stomata in plants, opening for gas exchange and closing to conserve water.
D. The tracheal tubes are continually open in large terrestrial insects.
E. They contain respiratory pigments to enhance oxygen transport.
Answer: C
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Adaptive radiation is best described as the
A. existence of groups of closely related species recently evolved from a common ancestor. B. existence of groups of distantly related species recently evolved from a common ancestor. C. existence of groups of closely related species recently evolved from different ancestors through hybridization. D. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species.
All gametes contain
a. two chromosomes. b. two identical sets of chromosomes. c. two different sets of chromosomes. d. one chromosome. e. one set of chromosomes.
A commensalism bacterium
A) does not receive any benefit from its host B) is beneficial to its host C) may also be an opportunistic pathogen D) isn't capable of causing disease in its host E) always causes disease in its host
A G1 somatic cell nucleus in a female diploid Myrmecia pilosula (bulldog ant) contains 2 picograms of DNA. How much DNA would be expected in a metaphase I cell of a female?
A) 16 picograms B) 4 picograms C) 8 picograms D) 32 picograms E) Not enough information is provided to answer the question.