Concept explainers
Introduction:
The ability to do work is called energy. There are two types of energy, i.e. kinetic energy and potential energy. The energy which is in the stored form is called potential energy. Example of potential energy is drawing a bow, stretching of a rubber band. In the same way cell also required energy to do the work. Potential energy is stored in the bonds, which connects the atoms in molecules.
Answer to Problem 1MCQ
Correct answer:
The best example of potential energy in the cell is a molecule of glucose. Therefore, the option b. is correct.
Explanation of Solution
Reason for the correct statement:
A molecule of glucose can undergo both the glycolysis and the citric acid cycle pathway. It releases an ATP molecule in both the pathways using the electron transport chain. When the glucose molecule is broken down, they release energy. They are not an energy molecule, but can be broken down to from energy molecule ATP.
Option b. is given as potential energy in a cell is “A molecule of glucose”.
As, “the molecules of glucose break down and generates energy”, is the correct answer.
Hence, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “Cell division”.
Cell division is a process by which a parent cell divides into two daughter cells. The energy is exhausted during cell division. So, it is a wrong answer.
Option c. is given as “movement of a flagellum”.
The flagella are the motile structures that offer movement to cell. The flagella are the best example of kinetic energy. So, it is a wrong answer.
Option d. is given as “assembly of a cellulose fiber”.
The cellulose is a polysaccharide whose monomer is glucose. Here the cellulose fibers provide the structural framework to the cells. The energy stored in the cellulose cannot be utilized in the terms of energy. So, it is a wrong answer.
Hence, option a., c., and d. are incorrect.
Glucose is not an energy molecule, but can generate ATP, which is known as the powerhouse of the cell. It can be broken down to release energy. So glucose is an example of potential energy.
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Chapter 4 Solutions
Biology: Concepts and Investigations
- Suppose one of your cells has a solute concentration of 10%. If we put it in a glass of sugar water that has a 15% solute concentration, what will happen to the cell as a result of osmosis? A. water will move into the cell B. nothing C. its volume will fluctuate up and down D. water will leave the cell E. sugar will move into the cellarrow_forwardWhich of the following enables ions such as sodium to cross a plasma membrane? A. phospholipid bilayer B. peripheral proteins C. integral proteins D. desmosomesarrow_forwardWhich of the following types of proteins allow materials to move into, or out of, the cell?a. receptor proteins b. junction proteins c. enzymatic proteinsd. channel proteinsarrow_forward
- Any one out therearrow_forwardWhat direction is the sugar molecule (the blue hexagon) going to diffuse? a. Into the cytoplasm b. Into the extracellular fluid (i.e. the fluid outside the cell) c. The same number of sugar molecules will move into the cytoplasm and the extracellular fluid. d. No diffusion will occur - the membrane prevents all molecules from entering or exiting a cell.arrow_forwardWhy can't ions like sodium (Na+) or potassium (K+) diffuse directly through the phospholipid bilayer? A. Ions can only use active transport to move through the membrane B. Ions are hydrophobic and are repelled by the polar membrane C. Ions are polar and are repelled by the nonpolar part of the membrane D. Ions need to become stable before entering the cellarrow_forward
- Which of the following can most easily pass through the phospholipid bilayer of the cell plasma membrane without the involvement of proteins? A. small non-polar molecules B. small polar molecules C. large non-polar molecules D. large polar moleculesarrow_forwardCellular organization (e.g. movement of organelles) is facilitated by Cells are capable of resisting mechanical stress due to the presence of Select one: a. microtubles, intermediate filaments b. actin, intermediate filaments c. intermediate filaments, actin d. microtubles, actin e. actin, microtubules Next pagearrow_forwardWhich of the named systems is isotropic? Select one: a. Endoplasmic reticulum membrane b. Nuclear membrane C. Matrix of mitochondria d. Plasma membranearrow_forward
- Which of the named systems is isotropic? Select one: a. Endoplasmic reticulum membrane Ob. Nuclear membrane C. Matrix of mitochondria d. Plasma membranearrow_forwardWhich of the following organelles and molecular complexes carries out catabolic reactions as one of its main functions? a. ribosomes b. rough endoplasmic reticulum c. chloroplasts d. Golgi complex e. lysosomesarrow_forwardIdentify the following properties as belonging to mitochondria, peroxisomes, or ribosomes. a. Detoxify chemicals such as alcohol b. Can be bound to a membrane or suspended in the cytosol c. Metabolize fatty acids d. Make most of the ATP for the cell e. Synthesize proteins f. Produce certain phospholipidsarrow_forward
