SIMILARITIES‚ DIFFERENCES‚ AND DEFINITIONS Gametes are mature haploid reproductive cells that unite to form a zygote that develops into a new individual. Gametes are also called sex cells. An egg or ovum is a haploid female reproductive cell or gamete whereas a sperm is a male haploid reproductive cell. A zygote is the initial cell that is formed as a result of the union of a male and a female gamete by means of sexual reproduction. The two haploid cells merge to give rise to a diploid cell which marks
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is common to whale‚ seal and shark? a. Homoiothermy b. Seasonal migration] c. Thick subcutaneous fat d. Convergent evolution Sol. Shark is poikilothermous. All three species show adaptations for aquatic life while these are not closely related. Correct choice: (4) Q. 5. Which one of the following is not a constituent of cell membrane? a. Phospholipids b. Cholesterol c. Glycolipids d. Proline Sol. Correct choice: (4) Q. 6. Select the wrong statement from the following: a. The chloroplasts
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Some of you have been asking for clarification regarding your optional use of the MSAF‚ the student self-reporting absence form. As you may know‚ this is allowance that you are permitted to use once per term to address temporary illnesses and deadline pressures. The allowance provided is generally five days‚ but faculty are asked to specify how the MSAF is to be applied in their particular course. Here are my guidelines: For all other more serious illnesses and absences‚ you would follow the
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single cell to divide and produce all the differentiated cells in an organism‚ including extraembryonic tissues. Totipotent cells formed during sexual and asexual reproduction include spores and zygotes. Zygotes are the products of the fusion of two gametes. In some organisms‚ cells can dedifferentiate and regain totipotency. For example‚ a plant cutting or callus can be used to grow an entire plant. Human development begins when a sperm fertilizes an egg and creates a single totipotent cell called
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1.1 Studying the Structure of Cells In 1665‚ English scientist Robert Hooke became the first person to study cells Cell Structure Nucleolus: Makes Ribosomes‚ which help to make proteins Nuclear Membrane: Protects the contents of the nucleus Nuclear Pores: Allow materials‚ such as ribosomes‚ in and out of the nucleus |Light Microscope |Electron Microscope | |Uses light source |Beams of electrons
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I don’t believe in having cell phones during class‚ just like a lot of others. Cell phones are distracting students who are around them‚ students are not paying attention‚ their entering phone numbers‚ playing games‚ and they are getting in trouble. Does this sound appropriate to you? Do you agree with having cell phones in class? If you say yes to these questions‚ I hope to persuade you by the end of ‘Cell Phones in Class’. I have noticed many students have been texting during class. I don’t know
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Chapter 1 Cell Theory- in the 18th century‚ two scientists came up with the cell theory. Schleiden and Schwen. 3 corollaries of the cell theory: -all cells are alike in chemical composition -all cells store and process information in the same way -all cells arise from other cell through cell division 5 types of different Microscopes 1. Light Microscope- produces 2-D image Direct descendants of Hooks scope> take two lenses to a light source> used this to magnify images up to 1‚000 fold.
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Cell Size: Is Bigger Better? Problem: Why are cells small? Objective: To see the relationship between cell size and diffusion of materials. Hypothesis: If we cut three different sizes of cells‚ then the smallest one will survive the longest due to its sufficient permeable membrane. Cube | Total Volume (cm^3) | Surface Area (cm^2) | Index SA/VOL | 3 | 27 | 54 | .5 | 2 | 8 | 24 | .33 | 1 | 1 | 6 | .16 | Index of Cubes Cube Index SA/VOL Surface Area to Volume Cube | Total
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as a matter of fact‚ they were difficultly communicating through sending letters to each other‚ which was one of the easiest ways to communicate at that time: The best way to translate that contrasting is Cellphone Vs. Letters‚ which is the battle between the modern life and the ancient life. . When we observe how cellphones have made our lives much easier in many different ways‚ we would not be able to think about how difficult it was for people before cellphones to live and get in touch
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Biology – Assignment One Cells. Question One Explain the roles of the main components and features of a cell to the cell function. A typical animal cell is rounded in shape‚ surrounded by a cell membrane. This holds in the cytoplasm‚ which contains other structures such as the nucleus‚ ribosomes‚ and mitochondria. Each cell has tiny structures inside called organelles; each type of organelle performs a particular function. For example there are mitochondria (power stations)‚ ribosomes (protein
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