1-Name one cell structure that is visible at high magnification ..pdf

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1-Name one cell structure that is visible at high magnification . 2-What organelle directs protein synthesis? 3-Name one function of a ciliated cell. 4-When a cell is not dividing it is in: M Phase Anaphase Mitosis Interphase Telophase 5-A cell in metaphase has chromosomes lined up in the middle of the cell. True False Solution 1. Using the light microscope one can view cell walls, vacuoles, cytoplasm, chloroplasts, nucleus, and cell membranes. Light microscope use lenses and light to magnify cell parts. 2. Ribosome, nucleoli directs the protein synthesis in the cells. 3. Cilia are microscopic, hair like structures that extend outward from the surface of many animal cells. They help in cell cycle, replication, or movement of cells. 4. The mitotic phase (M phase) is the phase where the cell is not dividing. It includes mitosis and cytokinesis. The correct answer is option A. 5. In the metaphase phase, the chromosomes line up in the middle of the cell to form a metaphase plate. So, the correct answer is True..

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Homecell divisionCell division Cell division Miller November 05, 2022 Every living organism depends on the growth and multiplication of its cells for growth and development because a multicellular organism begins as a single cell and undergoes repeated division. The characteristic trait of all living things is an increase in cell size brought on by growth. The cell starts to divide once its growth has reached its maximum. An organism grows vegetatively when its number of cells increases through cell divisions that follow a geometric progression. The three stages of cell division, which is a continuous and dynamic process, are as follows: Replicating the genome or DNA Karyokinesis, or nuclear division Cytokinesis, also known as cell division Based on the number of genomes present in the daughter cells in comparison to the dividing parent cell, there are two types of cell division: mitosis and meiosis. 1. Mitosis- W. Flemming first used the word mitosis in 1882. Mitosis, also known as somatic division, is the process by which a body cell divides into two daughter cells, each of equal size and with the same number of chromosomes as the parent cell. 2. Meiosis- J. Meiosis was the first to use the term. B. Farmer and J. Smith in 1905 Moore, E. Only the gonads (germ mother cells) undergo meiosis during the development of gametes like sperm and ovum. Meiosis is the process by which chromosomes go from having two copies, or 2N or diploid, to having only one copy, or N or haploid. Additionally known as the reduction process. Every cell that is able to divide undergoes a regular cycle of alterations known as the cell cycle. A cell is diploid when it begins its cycle. Phases of cell cycle The cell cycle has two phases: the long interphase, also known as Iphase, and the short mitotic, also known as M-phase, phases. 1. Interphase- The interphase is the period of time between telophase's conclusion and the start of the following Mphase. The stage is long and complicated, lasting between 10 and 30 hours. The cell develops during this phase by producing biological molecules like lipids, proteins, carbohydrates, and nucleic acids. First gap, also known as the G1 phase, second gap, also known as the G2 phase, and synthetic phase make up the interphase. (i) G1 phase- The G1 phase represents the duration between the previous mitosis and the start of DNA synthesis. During this phase, a newly formed cell begins to grow. During this stage, a wide range of biological molecules—including RNAs, proteins, lipids, and some non-histones—are created. In order to prepare for the DNA replication that will occur next to it, normal metabolism is carried out. This phase does not involve DNA synthesis. (ii) S Phase- Each chromosome is duplicated during this phase by replicating new DNA molecules using the existing DNA as a template. Only in S-phase do histone protein and their mRNA, some non-histone protein, and new nucleosome formation take place. Most eukary

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f the probabilities of having a male or female child are both 0.50, find the probabilities that a family\'s fourth child is their first son, a family\'s seventh child is their second daughter, a family\'s tenth child is their foruth or fifth son. Solution The probability of a Son is 0.5 The probobility of a daughter is 0.5 (a) The probability of a family’s fourth child is their first son is 4c1*(0.5)^1*(0.5)^3=0.25 (b) The probability of a family’s seventh child is their second daughter7c2*(0.5)^2*(0.5)^5=0.16406 (c) The probability of a family’s tenth child is their fourth or fifth son (10c4*(0.5)^4*(0.5)^6) +(10c5*(0.5)^5*(0.5)^5) = 0.20507+0.24609 =0.45116.

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Explain how the development of technology is a system of events and not just a single event. Give a historical example that demonstrates this concept. Solution Engineering, the systematic application of scientific knowledge in developing and applying technology, has grown from a craft to become a science in itself. Scientific knowledge provides a means of estimating what the behavior of things will be even before we make them or observe them. Moreover, science often suggests new kinds of behavior that had not even been imagined before, and so leads to new technologies. Engineers use knowledge of science and technology, together with strategies of design, to solve practical problems. In return, technology provides the eyes and ears of science—and some of the muscle, too. The electronic computer, for example, has led to substantial progress in the study of weather systems, demographic patterns, gene structure, and other complex systems that would not have been possible otherwise. Technology is essential to science for purposes of measurement, data collection, treatment of samples, computation, transportation to research sites (such as Antarctica, the moon, and the ocean floor), sample collection, protection from hazardous materials, and communication. More and more, new instruments and techniques are being developed through technology that make it possible to advance various lines of scientific research. Technology does not just provide tools for science, however; it also may provide motivation and direction for theory and research. The theory of the conservation of energy, for example, was developed in large part because of the technological problem of increasing the efficiency of commercial steam engines. The mapping of the locations of the entire set of genes in human DNA has been motivated by the technology of genetic engineering, which both makes such mapping possible and provides a reason for doing so..

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Distinguish between ectothermic and endothermic animals. Give at least three examples of each. Discuss at least two behavioral mechanisms that endothermic animals have that aid them in thermoregulation. Solution Ectothermic animals - These animals obtain heat from the environment e.g. sun, heat rock surface. they are also called known as cold blooded animals. examples are reptiles, amphibians, fishes and invertebrates. Endothermic animals - These animals have constant body temperature that is they are not depend to external source. they are also knowns as warm blooded. exaples are birds, mammals. Endothermic animals maintain thier body temperature on the basis of environment like if they are in cooler environment they generate heat from the body to get constant temperature. endothermic animals use food to generate energy to perform various activities, the energy also produce heat energy which maintain the constant temperature of the body..

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Economics Today Identify the various taxes government utilizes to fund the public sector and the impact on both consumer and producers Solution The different taxes levied by government are: (1) Income tax, which is levied on income of individuals and corporations. As income tax rate increases, both individual and corporate net earnings go down. Individuals get lower disposable income, which lowers consumption demand, and corporations are discouraged to invest, so investment demand reduces. There is an overall reduction in national income. (2) Sales / Excise / Value added tax is levied on goods and services produced. They are levied as a percent of sale price of the good or serice in question. Higher tax rate lowers the price received by producers, so they become discouraged to increase output if they cannot pass off majority share of the tax incidence to the consumers. As a result, aggregate supply goes down, causing an inflation. (3) Import tax or tariff is levied on imported goods. A tariff raises domestic price of the good and amount of imports go down, since consumers face higher price. But at higher price, producers increase output, which increase net exports and improves the trade deficit. (4) There are country-specific taxation system, for example in the US there is Social Security Tax, in India there is an educational cess, and so on..

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Why are R waves (Figure) used to determine heart rate rather than T waves? Solution R wave: Mainly its represents first upwards deflection after P wave, Easiest wave form for detremaing the heart function R wave minaly represents the part of VENTRICULAR DEPOLARIZATION , its mainly enlarge with ventricular hypertrophy T wave; Represents the repolarization of the ventricles, this T wave inverted or flat in the condition of the mycordial ischemic and bundle branch block after ventriculr depolarisition the total heart rhytham will be completed so because R wave heart rate will be determains.

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