Bacteria Types and Classification

All Bacteria have the following characteristics: Unicellular and stick together in colonies Are prokaryotic (no nucleus, vacuoles, mitochondria or chloroplasts) They have a single chromosome in a DNA loop They reproduce asexually by binary fission Live in moist environment and are inactive in dry environments Two groups of Bacteria 1.  Archaebacteria – primitive bacteria that…

Ethical/ Social Issues in Biology

Organ Transplantation –          Living donations of the kidney, part of liver, lobe of lung, part of intestine and portion of pancreas can be made –          A donor must be healthy in order to give an organ –          The demand for living organs is increasing –          For cultural and personal reasons, some are resistant to transplants…

Synaptic Transmission

> synapse: spaces between neurons, or between neurons and effectors > vesicles containing chemical neurotransmitters are located at the end of neuron axons Electrical Signals: > electrical impulses moving along the axon stimulate the release of neurotransmitters Chemical Signals: > neurotransmitters are released from the presynaptic neuron and diffuse across the synaptic cleft > neurotransmitters…

The Nervous System Anatomy and Function

The nervous system is an elaborate communication system that functions to regulate the actions of your body to maintain the internal environment within safe limits Nerve Cells: Glial cells – non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system. Functions: – surround neurons and…

Thermoregulation

Thermoregulation is the maintenance of body temperature within a range that enables cells to function efficiently. Mammals, including humans, are endotherms, able to maintain a constant body temperature regardless of our surroundings. The hypothalamus acts as your body’s “thermostat”, detecting changes in body temperature and sending out messages to help restore the normal body temperature.…

Energy Flow in Living Systems

Living organisms must continually capture/acquire, store, and use energy to carry out the functions of life. Capturing/acquiring, storing and using energy are accomplished through cellular chemical processes. Cells are chemical machines that obey fundamental chemical and physical laws of nature. The sum of a cells chemical reactions is called metabolism. Energy Energy is the ability…