Where is that molecule located in photosynthetic cells? What would happen to photosynthesis if the green light waves that reach a vegetable were blocked? When a solution is less concentrated than other the adjective hypotonic is given and the more concentrated is called hypertonic. The structural and regulatory genes collectively constitute the genotype which determines the phenotype, i. For example, don't answer a question about speciation with a response about the limitations of the term species. Ans: Literally speaking palindrome is a word that reads the same backward and forward. What are the three main parts of a eukaryotic cell? The cell theory is one of the basic theories of Biology. Sex chromosomes also have genes related to other biological functions.
The pattern of majority of biology exams are multiple choice questions. The endoplasmic reticulum is a delicate membranous structure contiguous to the nuclear membrane and present in the cytoplasm. The action of facilitator proteins in facilitated diffusion makes this type of diffusion faster than simple diffusion under equal concentration gradients of the moved substance. Cell Structure Review — Image Diversity: cytoplasmic inclusions 22 :: Where in the cell can ribosomes be found? The acrosome, located in the anterior end of the sperm cell, is a specialized region of the Golgi apparatus that accumulates great amount of digestive enzymes. Karyotype is the set of chromosomes of individuals of a given individual or species concerning morphology and number of each chromosome or pair of homologous.
The branching pattern of tree is calculated using the principle of parsimony based on economy to determine the minimum number of genetic changes required to derive the sequence of the gene in each organism from a common ancestor. What is the main cell organelle involved in cell digestion? Concentration is a term used to designate the quantity of a solute divided by the total quantity of the solution. The membrane lipids are phospholipids, a special type of lipid to which one extremity a phosphate group is bound thus assigning electric charge to this region of the molecule. Ribosomes can be found free in the cytoplasm, adhered to the outer side of the nuclear membrane or associated to the endoplasmic reticulum membrane defining the rough endoplasmic reticulum. Within the Golgi apparatus proteins are chemically transformed and when ready they are put inside vesicles that detach from the organelle. It is made of an extensive network of fibers dispersed in the cytoplasm and anchored in the plasma membrane.
It is not delimited by membrane. The phenomenon of overlapping genes maximizes the coding capacity of a genome and can also provide a means for the regulation of expression of genes. It is not delimited by membrane. What is the difference between osmosis and diffusion? What are the molecular facts that support the hypothesis? Think of drafting a flow chart to show the process. Proteins can be found embedded in the lipid bilayer and there are also some carbohydrates bound to proteins and to phospholipids in the outer face of the membrane.
In which structures and cellular processes do microtubules participate? Intracellular digestion is classified into two types: heterophagic intracellular digestion and autophagic intracellular digestion. What is the cell theory? Cell Structure Review — Image Diversity: mitochondria 29. There is difference between the optimun color frequency for the two main types of chlorophyll, the chlorophyll A and the chlorophyll B. Sex chromosomes are also called allosomes the other chromosomes that are not sex chromosomes are called autosomes. Intermediate filaments are made of protein too. Sex chromosomes also have genes related to other biological functions.
Why can mitochondria be considered the power plants of the aerobic cells? Carbohydrates appear in the outer surface of the membrane associated to some of those proteins under the form of glycoproteins or bound to phospholipids forming glycolipidis. The lac operon occurs in Escherichia coli at ca. The main differentiations are the microvilli and the structures for reinforcement of adhesion or union between cells cell junctions. In that situation the cell wall pressure acts to compensate the osmotic pressure thus forbiding excessive increase of the cellular volume and the cell lysis. Cells can be classified as eukaryotic or prokaryotic. Concentration is a term used to designate the quantity of a solute divided by the total quantity of the solution. What is the most likely etiology of this disorder? Active transport, in the other hand, is the transport of substances across membranes against their concentration gradient, from a less concentrated to a more concentrated region.
The green color is reflected and such reflection provides the characteristic color of plants. Is that substance a polymer made of which monomer? Most bacteria also present an outer cell wall made of peptidoglycans and other organic substances. What are the substances that constitute the chromatin? What is the other name given to the secondary constriction? Play attention to the , so you actually address what the question is asking. Can solutions with same concentration of different solutes have different osmotic pressures? Introns themselves are usually noncoding. Why is this type of intracellular digestion intensified in an organism undergoing starvation? These vesicles fuse with others that carry the material to be digested and then digestion takes place. When the plasmolysed cell is placed under hypertonic medium it absorbs water and becomes a turgid cell. In this situation the cell membrane retracts and detaches from the cell wall.
In the fluid there are proteins, enzymes and other important substances for the nuclear metabolism. Ans: A mutator gene or mutator is designated as must within which certain mutations cause an increase in the spontaneous mutation rate in other genes, e. In some types of cells, the cell membrane present differentiations that are necessary for the specific functions of the cells. Rigorously the pair of identical chromatids bound in the centromere are two copies of the same chromosome and therefore they are two identical chromosomes and not only one. Semipermeable membranes are those that let only solvent, like water, to pass through it. Cell Membrane Review — Image Diversity: passive transport 54. In mitochondria the two last steps of the cellular respiration take place: the Krebs cycle and the respiratory chain.
It is sometimes reasonable to assume that highly conserved protein like globin and cytochorme c can be used as a molecular clock to measure how long the species have been diverging from each other. Before the discovery of the cell, it was not recognized that the living beings were made of building blocks like cells. It is not delimited by membrane. Osteoclasts are responsible for the the continual renovation of the osseous tissue since their lysosomic enzymes digest the osseous matrix. Which of the following is a transcription factor? Does this resistance facilitate or make it difficult the entrance of water in the cell? In general it is done by lysosomes. Cell Structure Review — Image Diversity: endoplasmic reticulum 23. The cell theory is one of the basic theories of Biology.