Ans.
Sieve elements -
Sieve tube -
Companion cells-
Describe the differences in structure and function of sieve tubes, sieve elements and companion cells.
Give evidence to support the hypothesis that sieve-tube elements and companion cells are closely related developmentally.
Saved Rays consist primarily of Multiple Choice dead cells. long-lived parenchyma. tracheids. vessel elements. sieve tubes < Prev 54 of 100 ! Next >
Translocation What is transported? In xylem or phloem? Direction of flow Cells involved (note alive or dead, which plant groups have them, function) Sieve tube elements: Companion cells: Does this process require the plant to expend energy?
Which of these cells in a plant are dead at maturity? Choose all that apply. A. Phloem fibers B. Guard cells C. endodermis D. Companion cells E. Palisade mesophyll cells F. Sieve tube elements G. Pericycle cells H. Xylem fibers I. Xylem vessel elements
Describe and discuss the solute stream in the plant body. Include in answer: -a description of the cells and tissues of the food production and food storage tissues of flowering plants. -a description of the special association of sieve elements, companion cells and bundle sheath cells. -a description of the biomolecules that are transported as food and nitrogen carriers. -a description of how phloem conducts food from source to sink according to the pressure flow hypothesis including phloem loading in...
Describe the structure and function of elements needed for transcription, including the promoter, RNA polymerase core enzyme and holoenzyme, sigma factor, and template and non-template (coding) strands of DNA. eukaryotes - . List major differences between transcription and RNA processing in bacteria and o What is coupled transcription/translation? o What is a polyribosome? Is it exclusive of bacterz - Discuss major components and events in RNA processing, in - Describe tRNA stru - Discuss mech cluding, introns and exons, splicing....
Draw and describe differences between euchromatin and heterochromatin; include differences in their structure as well as functional differences. Compare and contrast facultative and constitutive heterchromatin.
5. List the 6 Neuroglia cells located in the nervous system and describe their general structure, function, and location. (10 points) 6. Describe the Myelin sheath and tell me why it is important? (3 points)
C. CELLS THAT TRANSPORT STUFF 1. Make several cross and longitudinal sections of potato and celery stems to observe vessels and tracheids of xylem tissue, and sieve cells of the phloem. What is the function of each of these types of cells? 2. Stain the sections with Aniline Blue (stains the B-1,3 glucose polymer callose located in sieve elements) and Phloroglucinol (stains the phenolic polymer lignin in secondary walls of vessels and tracheids). Were you correct in identifying phloem and...
Cells are the basic units of structure and function in all organisms. A key feature in the life cycle of plants is the alternation of multicellular haploid and diploid generations. Imagine a lineage of flowering plants in which mitotic cell division did not occur between the events of meiosis and fertilization. Describe how this change in the timing of cell division would affect the structure and life cycle of plants in this lineage.