Classification.Respond to the following statements in reference to the five animal phyla listed below.
A. This phylum has no tissues or organs.
B.
C. Members of this group have a brain with nerve cords, have a saclike or branched gut, and lack a circulatory system.
D. Tapeworms are members of this phylum.
E. Members of this phylum have a pseudocoelomic cavity.
F. Members of this phylum have a brain with a ventral nerve cord, a complete gut, and a circulatory system that is usually closed.
A. Porifera
B. Cnidaria
C. Platyhelminthes
D. Platyhelminthes
E. Nematoda
F. Annelida
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Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Krebs cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed. B. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy. C. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase. D. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.
Which of the following is a major problem for sessile animals?
a. They are unable to escape unfavorable environmental conditions. b. They are unable to sexually reproduce. c. They are limited in the variety of food they can consume. d. They are not capable of locomotion during their lifetime. e. As adults, they are haploid.
A pollen grain is a(n) ________
A) female gametophyte B) sporophyte C) male gametophyte D) integument
Tuberculin skin testing
A) Will be positive in active TB. B) Will be positive if person has had previous exposure. C) All of these choices are correct. D) Injects PPD intradermally. E) Uses a purified protein filtrate of Mycobacterium tuberculosis.