practice_book_biology

Binds to the tata box and assists in mediating

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Unformatted text preview: ence required for gene transcription that extends approximately 100 nucleotide pairs in front of the RNA start site 147. Stimulates RNA transcription from either an upstream or downstream position GO ON TO THE NEXT PAGE. 142. The most primitive vascular plant cells that conduct water and provide support 143. Cells that primarily provide rapid transport of water in angiosperms 144. Cells that transport photosynthate Unauthorized copying or reuse of any part of this page is illegal. 41 Questions 148-150 refer to the diagram below of a capillary net around an alveolus. (A) (B) (C) (D) (E) Alveolar space Alveolar wall Capillary wall Plasma Erythrocyte 148. Prior to equilibrium, the highest partial pressure of oxygen occurs at this site. 149. Carbon monoxide causes respiratory failure by outcompeting oxygen at this site. 150. Hemoglobin is located primarily at this site. Questions 151-153 (A) (B) (C) (D) (E) Tethys Pangea Gondwana Laurasia Archean 151. Precursor to the northern group of continents 152. Precursor to Africa, South America, Australia, Antarctica, and India 153. The supercontinent that began to break up during the Triassic GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 42 Directions: Each group of questions below concerns a laboratory or an experimental situation. In each case, first study the description of the situation. Then choose the one best answer to each question and fill in completely the corresponding space on the answer sheet. Questions 154-155 M-phase-promoting factor (MPF) triggers mitosis by activating other proteins that function in cell division. Active MPF consists of two associated proteins, cyclin and Cdc2. The Cdc2 component of active MPF is a protein kinase. The relative concentrations of active MPF, Cdc2, and cyclin were monitored during the cell cycle and are depicted in the figure below. 154. During the cell cycle, active MPF decreases at the end of mitosis. This can be best explained by the (A) (B) (C) (D) (E) increase in Cdc2 during mitosis increase in cyclin during mitosis decrease in cyclin during mitosis decrease in Cdc2 during mitosis decrease in inactive MPF during mitosis 155. If MPF activates a series of enzymes, one of which inactivates MPF, it is likely that one of the enzymes activated by MPF (A) (B) (C) (D) (E) degrades cyclin only degrades Cdc2 only degrades cyclin and Cdc2 stimulates cyclin stimulates Cdc2 GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 43 Questions 156-157 refer to the following experiment. The marine coenocytic green alga Caulerpa grows in a unidirectional pattern. Photosynthetic fronds are produced on its upper surface and anchoring rhizoids on the lower surface (Figure I). When the same organism was inverted, new rhizoids were then initiated on the newly formed lower surface, while fronds were initiated on the newly formed upper surface (Figure II). Secondary fronds can be initiated from the margins of the primary fronds. In another experiment, it was found that if the secondary f...
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This document was uploaded on 03/16/2014 for the course BIO 1434 at UT Arlington.

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