In an experiment to determine the water potential of fresh beetroot tissue, a student cut 12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken from the middle of a large beetroot. Two chips were immersed in each of six covered Petri dishes, one containing water and the others containing solutions of sucrose of different molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured accurately against graph paper seen through the bottoms of the dishes. Mean percentage changes in length of the chips were then measured after six hours. d. Why were at least two chips added to each dish? e. Why were the dishes covered when left? f. Suggest one advantage of measuring change in length rather than change in mass of the chips in this experiment. Suggest one advantage of measuring change in mass rather than change in length.
In an experiment to determine the water potential of fresh beetroot tissue, a student cut 12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken from the middle of a large beetroot. Two chips were immersed in each of six covered Petri dishes, one containing water and the others containing solutions of sucrose of different molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured accurately against graph paper seen through the bottoms of the dishes. Mean percentage changes in length of the chips were then measured after six hours. d. Why were at least two chips added to each dish? e. Why were the dishes covered when left? f. Suggest one advantage of measuring change in length rather than change in mass of the chips in this experiment. Suggest one advantage of measuring change in mass rather than change in length.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
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Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
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4 (d-g)
Transcribed Image Text:4. In an experiment to determine the water potential of fresh beetroot tissue, a student cut
12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken
from the middle of a large beetroot. Two chips were immersed in each of six covered Petri
dishes, one containing water and the others containing solutions of sucrose of different
molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured
accurately against graph paper seen through the bottoms of the dishes. Mean percentage
changes in length of the chips were then measured after six hours.
d. Why were at least two chips added to each dish?
e. Why were the dishes covered when left?
f. Suggest one advantage of measuring change in length rather than change in mass of the
chips in this experiment.
g. Suggest one advantage of measuring change in mass rather than change in length.
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