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All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth and development, homeostasis, energy processing, and evolution. When viewed together, these characteristics serve to define life.
- Prokaryotic Transcription
Energy in Living Systems. From Mouth to Molecule: Digestion....
- Meiosis II
The mechanics of meiosis II is similar to mitosis, except...
- Types of Mutations
Insertion or Deletion: An insertion changes the number of...
- Levels of Organization
For example, each tree in a forest is an organism....
- Using Credible Sources
Learning Objectives. Course Objective for this section:...
- Eukaryotic Transcription
Eukaryotic Transcription Prokaryotes and eukaryotes perform...
- Prokaryotic Transcription
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth and development, homeostasis, energy processing, and evolution. When viewed together, these characteristics serve to define life.
- Cells and Organization
- Metabolism
- Environmental Adaptation
- Homeostasis
- Growth and Development
- Reproduction
- Evolution
- Reference
Cells are the basic unit of life. The smallest organism consists of one cell. Within that cell is the cellular equivalent of organs, called organelles. Organelles are made of molecules or macromolecules such as carbohydrates, lipids, proteins, and nucleic acids. These organelles serve different functions including transferring ribonucleic acid (RNA...
Organisms must acquire and use energy in order to maintain their complex, living systems. Cells metabolize molecules, such as nutrients, to produce energy and use it for other processes, like replicating deoxyribonucleic acid (DNA). Some organisms, including plants and some bacteria, can convert light energy to produce nutrients. This is called pho...
Organisms must be able to adapt to their changing environments. For example, during the season when the sun is directly overhead, plants will grow upward, but they will grow more toward the side during those seasons when the sun is lower in the sky. Horses shed their coats in the spring and summer to allow for easier cooling during the warmer weath...
Organisms must maintain an internal environment that is conducive to cell metabolism. For example, humans must maintain a specific body temperature. When they are cold, they will shiver, a response that causes the muscles to produce more heat. When they are too warm, the body will produce sweat which carries heat away from the body when it evaporat...
All organisms undergo a process of growth and development. Single-celled organisms start as smaller cells that grow. The contents of the cell may become more diverse and complex. More complex organisms, such as humans, start out as a single cell that divides to create more cells. These new cells differentiate to develop into specialized cells that ...
All living organisms have DNA, which is genetic material containing the information and instructions for forming an organism. All organisms die and must be able to pass this genetic material on to create more organisms. This is done through reproduction. Single-celled organisms may divide in half and grow. Other organisms reproduce sexually, a proc...
The book, Biology, by Robert J. Brooker, et al., defines biological evolution as “the phenomenon that populations of organisms change over the course of many generations.” This can include the beak length and shape of a particular species of bird that is better suited to acquiring certain kinds of food in a particular environment. The characteristi...
Brooker, Robert J., Widmaier, Eric P., Graham, Linda E., and Stiling, Peter D. Biology. New York: McGraw-Hill, 2008.
Jun 12, 2012 · Most scientists classify living things into one of the following six kingdoms. Bacteria are single-celled microorganisms that don’t have a nuclear membrane. Protozoans are single-celled organisms that are generally much larger than bacteria. They may be autotrophic or heterotrophic.
Movement – the Spider monkey will move in the trees to look for food and avoid predators. Respiration – they breathe oxygen and make energy from it’s food. Sensitivity – the monkey can see with its eyes, can taste food and hear noise. Growth – they grow from being a baby and develop into adults.
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing.
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All living things—even the simplest life forms—have a complex chemistry. Living things consist of large, complex molecules, and they also undergo many complicated chemical changes to stay alive. Thousands (or more) of these chemical reactions occur in each cell at any given moment.
