Concept explainers
Introduction:
The cell is the basic “fundamental unit” of life. Every organism present in the environment is composed of cell. Cells perform a number of important activities that help in the survival of an organism. These activities are known as cellular activities.
Answer to Problem 1SQ
Correct answer:
All the cells have three basic structures. These are plasma membrane, cytoplasm, and DNA. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Option c. is given as “cytoplasm, DNA, and a plasma membrane.”
Every cell contains three basic structures that form a complete cellular unit. These three structures are:
• Plasma membrane:
The outer layer of cell that acts as a barrier is known as the plasma membrane. It surrounds all the cellular units and protects them from the external environment.
• Cytoplasm:
It is the middle layer of the cell. All the internal components of the cell are present in the cytoplasm.
• DNA:
DNA stands for “Deoxyribonucleic acid.” It is the genetic material present in the organisms that guide them to perform all the cellular activities.
Therefore, every cell contains these three basic units (plasma membrane, cytoplasm, and DNA).
Reason for incorrect answer:
Option a. is given as, “cytoplasm, DNA and, organelles with membranes.”
Every cell contains cytoplasm and DNA. The cell can have two types of organelles, one with membrane and other without a membrane. This indicates that it is not necessary that a cell contains an organelle with a membrane. Hence, option a. is incorrect.
Option b. is given as, “a plasma membrane, DNA, and a nuclear envelope.”
Plasma membrane and DNA are two important components that are present in every cell. However, it is not necessary that every cell has a nuclear envelope. For example, prokaryotes lack nuclear envelope but eukaryotes contain a well-defined nuclear membrane. Hence, option b. is incorrect.
Option d. is given as, “a cell wall, cytoplasm, and DNA..”
Every cell contains a cell wall and DNA. However, every cell does not contain a cell wall. For example, the plant cell has a cell wall but animal cells lack a cell wall. Hence, option d. is incorrect.
Hence, the options a., b., and d. are incorrect.
The three basic components present in every cell are cytoplasm, plasma membrane, and DNA. Thus, the correct option is c.
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Chapter 4 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
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- All cells have these three things in common:______ . a. cytoplasm, DNA, and organelles with membranes b. a plasma membrane, DNA, and a nucleus c. cytoplasm, DNA, and a plasma membrane d. a cell wall, cytoplasm, and DNAarrow_forwardHelp mearrow_forwardThis organelle is composed of extensive amounts of membrane. It synthesizes lipids and detoxifies harmful substances such as alcohol. This organelle is a. the smooth endoplasmic reticulum. b. a mitochondrion. c. a proteasome. d. a lysosome.arrow_forward
- Below are three statements - two of which are truths and one is a lie. Which of the following statements is a lie? a. Rough ER and smooth ER mainly function for protein synthesis. b. There are two types of secretory activities of a cell. c. A cell that makes steroid hormones has a high concentration of smooth endoplasmic reticulum.arrow_forwardWhich of the following organelles destroys malformed proteins, proteins that do not fold normally, and proteins that are no longer needed by a cell? a. centriole b. peroxisome c. proteasome d. nucleolusarrow_forwardA large structure, normally visible in the nucleus of a cell, whereribosomal subunits are produced is called a(n)a. endoplasmic reticulum. c. nucleolus.b. mitochondrion. d. lysosome.arrow_forward
- Which of the following statements is NOT true about the cell theory? a. All cells arise spontaneously. b. All cells arise from preexisting cells. c. All living organisms are made up of cells. d. Cell is the basic unit of life.arrow_forwardMatch each following organelle with its function: Select the INCORRECT match. a. Cytoskeleton/ Network of microtubulesand microfilaments b. RER/ Has sites for protein synthesis c. Nucleus/ Site of ribosome synthesis d. SER/ Contains enzymes for lipid synthesisarrow_forwardEukaryotic cells are more complex than prokaryotic cells. Which of the following are found only in a eukaryotic cell?a. cell wallb. plasma membranec. endoplasmic reticulumd. ribosomesarrow_forward
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