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…
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…
Initiation: – Upstream of the gene, RNA polymerase binds to a genes promoter region and unwinds the DNA double helix Elongation: – RNA polymerase starts building an mRNA, using the template strand of the DNA molecule, in the direction of 5’ to3’ – the strand that is not copied is called the coding strand – …
What Is a Real Hypothesis? A hypothesis is a tentative statement that proposes a possible explanation for some phenomenon or event. A useful hypothesis is a testable statement that may include a prediction. When Are Hypotheses Used? The keyword is testable. That is, you will perform a test of how two variables might be related.…
> 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…
– obtained from bacterial cells where they act as an immune system, they digest foreign DNA molecules from viruses – molecular scissors that cut DNA at a specific base-pair sequence (the recognition site) – they scan DNA, stop at their recognition sites, then disrupt the phosphodiester bonds and the hydrogen bonds between nucleotides cutting a…
– cyclic process in the stroma that converts carbon dioxide into carbohydrate molecules – three phases: 1) carbon fixation, 2) reduction reaction, 3) RuBP regeneration Phase 1: Carbon Fixation – C02 added to RuBP -> unstable 6-carbon intermediate -> 2 3-carbon PGAs – required to occur three times, 3 CO2 + 3 RuBP -> 6…
Light Reactions: – require chlorophyll and take place in thykaloid membranes – absorb light energy and transfer it to ADP and NADP+ – energy is transferred to carbohydrate molecules in the Calvin cycle Carbon Fixation: – incorporate molecules of CO2(g) into organic molecules, such as glucose – require energy from ATP and NADPH – takes…
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…
Mutations are errors made in the DNA sequence than can have negative side effects, no effect, or positive effects for an organism Point Mutations Mutations that occur at a certain point in the DNA Substitution – the replacement of one base in a DNA sequence by another base Deletion – the elimination of a base…
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.…
The human body works best at 37°C, with a 0.1% blood sugar level and a blood pH level of 7.35 The external environment and making demands on your body do not always provide the ideal conditions for life Your body must adjust these variations to maintain a stable internal environment Homeostasis is a term used…
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…
Function: ▪ synthesize and release hormones permitting them to act in concert and respond to changes in the body and maintain stability (homeostasis) ▪ Example organs – thyroid, pancreas (islets of Langerhans), adrenal glands, pituitary gland Tools: – hormones * chemicals released by cells in one part of the body that affect cells in other…
NADH and FADH2 carry electrons to the ETC Each become oxidized, losing two electrons to the ETC The Electron Transport Chain (ETC) Structure Located within the inner mitochondrial membrane Composed of various protein structures arranged in order of increasing electronegativity Ex. weakest electron attractor (NADH dehydrogenase) is at the beginning of the chain and the…
– O2 competes with CO2 for rubisco’s active site – rubisco catalyzes two reactions: 1) addition of carbon to RuBP; forms 2 PGA molecules (photosynthesis) 2) addition of oxygen to RuBP; forms 1 PGA and one glycolate (photorespiration) – photorespiration decreases the production of carbohydrates by removing PGA from the Calvin cycle – glycolate is…
Pancreas: > produces digestive enzymes and hormones > hormone producing cells are in the islets of Langerhans > islets contain beta (produce insulin hormone) and alpha cells (produce glucagon hormone) Insulin: > produced in beta cells > released when blood sugar level increases > cause muscle cells, the liver and other organs, to become permeable…
Carbohydrates are the first nutrient most organisms catabolise for energy, however, living things must metabolize other energy-rich nutrients to obtain energy in times of starvation Protein Catabolism – first digested into amino acids – amino groups are removed (deamination; amino group à ammonia [NH3]) – remaining portion of amino acid converted into various components of…
The quantity of energy associated with the formation of one mole of a substance from its elements (in their standard states). The standard states (at SATP) of most elements is solid, except for the gaseous diatomic molecules, H2, O2, N2, F2, Cl2, and the two liquid elements Hg and Br2. These energies can be looked…
The shape of a molecule determines many of its properties; For example: C4H10 is the formula for 2 separate molecules n-butane and isobutene Melting Point -138°C -159°C Boiling Point -0.5°C -12°C Enzymes—shape compatible with those molecules whose reactions they promote i.e. the enzyme sucrase breaks down the sugar molecule sucrose The shape of a…