Basic Biological principles
Answer key
1. What forms the outside layer of a cell?
A. Genetic material
B. Plasma membrane- answer
C. Endoplasmic Reticulum
D. Mitochondria
Answer Explanation: The plasma membrane forms the outside layer of a cell. It separates the cell from its environment and regulates the exchange of material into and out of the cell
2. What are the main characteristics of a cell?
A.Plasma membrane, Cytoplasm, DNA, and Ribosomes - answer
B. Mitochondria, Ribosomes, and DNA
C. Nucleic acids, Glucose, ATP, and Plasma membrane
D. Metaphase, DNA, Ribosomes, and Plasma membrane
Answer Explanation: All organisms consist of cells, and all cells share several characteristics that are essential to life. These four main characteristics are the plasma membrane, cytoplasm, DNA, and ribosomes.
3. All organisms on earth are composed of at least how many cells?
A. Five
B. Three
C. Twenty-five
D. One- Answer
Answer Explanation: Most living things are made up of one cell and they are called unicellular organisms. Many other living things are made up of more than one cell and they are called multicellular organisms.
4. What are the differences between Prokaryotic and Eukaryotic cells?
Answer Explanation: Eukaryotic cells contain membrane-bound organelles, including a nucleus. Eukaryotes can be single-celled or multi-celled. Prokaryotic cells do not contain a nucleus or any other membrane-bound organelle.
2. What is the role of the nucleus in a Eukaryotic cell?
Answer Explanation:
The nucleus is an organelle found in eukaryotic cells. Inside its fully-enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
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