Cell Biology Basics

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Questions and Answers

What is the primary function of mitochondria in a cell?

  • Control center of the cell
  • Powerhouse of the cell (correct)
  • Storage of genetic information
  • Protein production

Which of the following is a characteristic of a eukaryotic cell?

  • True nucleus (correct)
  • Cell wall only in plant cells
  • No nucleus
  • Only found in animals

What is the primary function of the cell membrane?

  • To provide structure and support
  • To store genetic information
  • To control what enters and leaves the cell (correct)
  • To produce proteins

What is the main difference between biotic and abiotic factors in an ecosystem?

<p>Biotic factors are living, abiotic factors are non-living (B)</p> Signup and view all the answers

What is the result of the energy loss at each trophic level, according to the rule of 10?

<p>A 10% energy loss (A)</p> Signup and view all the answers

What is the process of making energy from sunlight, according to the text?

<p>Photosynthesis (A)</p> Signup and view all the answers

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Study Notes

Cell Theory

  • Cells are the basic units of structure and function in living things
  • Cells come from other cells
  • All living things are made up of cells

Cell Types

  • Prokaryotic cells: cells with no nucleus
  • Eukaryotic cells: cells with a true nucleus

Cell Structures and Functions

  • Mitochondria: powerhouse of the cell
  • Nucleus: control center of the cell
  • Cell membrane: semi-permeable membrane that controls what enters and leaves
  • Cell wall: rigid wall outside the cell membrane in plant cells
  • Ribosomes: produce proteins
  • Chloroplasts: contain chlorophyll and are responsible for photosynthesis
  • Vacuole: storage tanks

Organ Systems

  • Circulatory system: circulates blood and oxygen throughout the body
  • Digestive system: breaks down food so the body can absorb
  • Respiratory system: takes in oxygen and releases carbon dioxide
  • Muscular system: provides movement, digestion, etc.
  • Skeletal system: provides support and structure
  • Nervous system: transmits messages and processes information

Ecosystems

  • Biotic factors: living things
  • Abiotic factors: non-living things

Energy Flow

  • Rule of 10: 10% energy loss at each trophic level

Photosynthesis and Cellular Respiration

  • Photosynthesis: process of making energy from sunlight
  • Cellular respiration: process of breaking down substances into simpler substances for energy

Relationships

  • Mutualism: both organisms benefit
  • Commensalism: one organism benefits, the other is neither harmed nor helped
  • Parasitism: one organism benefits, the other is harmed

Genetics

  • Dominant traits: represented by capital letters, cover recessive traits
  • Recessive traits: represented by lowercase letters, only show if two recessive alleles are present
  • Genetic mutations: changes in the DNA sequence

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