Maintaining a Balance Enzymes 1.1 Identify the role of enzymes in metabolism‚ describe their chemical composition and use a simple model to describe their specificity on substrates Enzymes are biological catalysts‚ meaning they are organic and speed up a chemical reaction without taking part in it. This means it has a vital role in metabolism where it ensures that the chemical reactions that make up metabolism can function fast enough to sustain life by lowering activation energy. Metabolism
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Exam Review – January 2013 Diversity Unit - List taxonomic ranks in order. What is the significance of this order? Domain‚ Kingdom‚ Phylum‚ Class‚ Order‚ Family‚ Genus‚ Species. Classification of species: kingdoms contain many different types of organisms‚ each taxon contains progressively fewer types of organisms‚ taxon “species” is narrowest category‚ containing only one type of organism. As you go from kingdom to species‚ organisms share more and more in common. - Explain and give an example
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Explain the structure and inheritance of genes (15 marks) A cell’s nucleus contains chromosomes‚ which are long‚ coiled packaged and organized chromatin (molecules of DNA). Chromatin is a complex of molecules found in cells‚ consisting of DNA‚ protein and RNA. Proteins are polypeptides (a large sequence of amino acids). The chief protein component of chromatin are histones‚ which package and order the DNA into structural units called nucleosomes in order to fit in the cell‚ as well as reinforce the
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Cheat Sheet for Test 3 What is stress? Any force that pushes the body out of optimum homeostatic conditions Stressors include Digesting food‚ exercising‚ waking after a long sleep Walking outdoors after being indoors Impending happy event such as a wedding or party‚ falling in love Arguments ‚ over work‚ exams The General Adaptation Syndrome is A predictable set of behavioral
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BIOLOGY 101 COURSE SYLLABUS FOR FALL 2012 Course Description Biology 101 is the first of a two-semester introductory course sequence designed primarily for science majors. It covers some central concepts in biology. Topics include molecules‚ cells‚ enzymes‚ photosynthesis‚ cellular respiration‚ cellular reproduction‚ genetics‚ and biotechnology. The laboratory includes basic laboratory skills such as safety‚ microscope use‚ and measurement‚ and it reinforces topics discussed in lecture
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either parent are placed into gametes during meiosis in the F generation. The F can be thought of as having been formed 1 1 from two haploid “input” gametes. In this case‚ the F is a dihybrid with AB on one chromosome and ab on the other 1 chromosome. You can tell this by looking at the parents. The F1 hybrid got AB from one parent and ab from the other parent (AB/ab). A dihybrid that is AB/ab can produce four possible “output” gametes through meiosis. Output gametes that match one of the input gametes
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|α cells |Cells in the islets of Langerhans that release glucagon in response to low blood glucose levels. | |Acetylcholine |A neurotransmitter (transmitter substance) found in cholinergic synapses. | |Acetylcholinesterase |An enzyme in the synaptic cleft that breaks down the transmitter substance acetylcholine. | |Actin |A protein
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Blueprint Of Life 1. Evidence of evolution suggests that the mechanisms of inheritance‚ accompanied by selection‚ allow change over many generations * Outline the impact on the evolution of plants and animals of: - Changes in physical conditions in the environment - Changes in chemical conditions in the environment - Competition for resources Physical Conditions | Chemical Conditions | Competition for resources | Change in physical conditions such as:- Temperature- Wind conditions-
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germination. Life for an animal begins when exiting the mother’s womb or from an egg. In both cases‚ birth is experienced; however‚ with plants the process is called mitosis and with animals it is called meiosis. In plants gametes are not produced directly‚ they have an extra step in which meiosis produces spores. Plants and animals are becoming known more and more for their vital human usage in many areas‚ such as
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Why offspring produced by the same parents are different in appearance Offspring differ somewhat from their parents and from one another. Instructions for development are passed from parents to offspring in thousands of discrete genes‚ each of which is now known to be a segment of a molecule of DNA. This essay will explore some of the reasons behind how and why these differences in appearance arise‚ from the base sequence of DNA through to the observed phenotype. Genes come in different varieties
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