Pearson, as an active contributor to the biology learning community, is pleased to provide free access to the Classic edition of The Biology Place to all educators and their students. The purpose of the activities is to help you review material you have already studied each enzyme acts only on a particular chemical called its class or have read in your text. Some of the material will extend your knowledge beyond your classwork or textbook reading. At the end of each activity, you can assess your progress through a Self-Quiz. To begin, click on an activity title.
Concept 1: How Do Restriction Enzymes Work? Concept 11: Allelic Frequency vs. Concept 3: How Do Guard Cells Function? Concept 5: The Genetic Code: RNA vs.
A plant hormone that generally acts to inhibit growth, promote dormancy, and help the plant tolerate stressful conditions. The movement of water and dissolved substances into a cell, tissue, or organism. The range of a pigment’s ability to absorb various wavelengths of light. The portion of the ocean floor where light does not penetrate and where temperatures are cold and pressures intense. Physiological adjustment to a change in an environmental factor. The automatic adjustment of an eye to focus on near objects. A substance that increases the hydrogen ion concentration in a solution.
Rain, snow, or fog that is more acidic than pH 5. A solid-bodied animal lacking a cavity between the gut and outer body wall. An organelle at the tip of a sperm cell that helps the sperm penetrate the egg. A globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other contractile elements in cells. A rapid change in the membrane potential of an excitable cell, caused by stimulus-triggered, selective opening and closing of voltage-sensitive gates in sodium and potassium ion channels. The energy that must be possessed by atoms or molecules in order to react. The specific portion of an enzyme that attaches to the substrate by means of weak chemical bonds.
The movement of a substance across a biological membrane against its concentration or electrochemical gradient, with the help of energy input and specific transport proteins. The evolution of features that make a group of organisms better suited to live and reproduce in their environment. A peculiarity of structure, physiology, or behavior that aids the organism in its environment. An equilibrium state in a population when the gene pool has allele frequencies that maximize the average fitness of a population’s members. The emergence of numerous species from a common ancestor introduced into an environment, presenting a diversity of new opportunities and problems. An adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed.
This energy is used to drive endergonic reactions in cells. An enzyme that converts ATP to cyclic AMP in response to a chemical signal. The tendency of different kinds of molecules to stick together. A hormone, produced by the anterior lobe of the pituitary gland, that stimulates the production of cortisol by the adrenal cortex. Referring to a structure arising from an unusual place, such as roots growing from stems or leaves. Bringing inward to a central part, applied to nerves and blood vessels. A gelatinous material prepared from certain red algae that is used to solidify nutrient media for growing microorganisms. The relative number of individuals of each age in a population. A member of a jawless class of vertebrates represented today by the lampreys and hagfishes.
A type of behavior involving a contest of some kind that determines which competitor gains access to some resource, such as food or mates. T cells and the appearance of characteristic secondary infections. An organic molecule with a carbonyl group located at the end of the carbon skeleton. An action that occurs either completely or not at all, such as the generation of an action potential by a neuron. An alternative form of a gene. The proportion of a particular allele in a population. The variation in the relative rates of growth of various parts of the body, which helps shape the organism. A mode of speciation induced when the ancestral population becomes segregated by a geographical barrier. A common type of polyploid species resulting from two different species interbreeding and combining their chromosomes.