1. In the plasma membrane‚ the phospholipid heads A) are hydrophobic and face outward towards the aqueous solution on both sides of the membrane B) are hydrophilic and face inward‚ shielded from water C) are hydrophilic and face outward towards the aqueous solution on both sides of the membrane D) are hydrophobic and face inward‚ shielded from water Points Earned: 0.5/0.5 Correct Answer(s): C 2. The function of chloroplasts is A) lipid synthesis. B) intracellular digestion
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Cellular organelle structure and function Nucleus The Nucleus is comprised of the pore perforated nuclear membranes‚ nucleoplasm‚ chromatin and the nucleolus at the core. The nuclear envelope consists of an inner and outer membrane that forms the outer structure. Contained within the nuclear membrane are nucloplasm which is the fluid medium in which the chromatin is present‚ chromatin being the genetic material. At the core of the nucleus is the nucleolus‚ where ribosomes are synthesized. The
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Lab Introduction • What molecules can pass through a semi-permeable membrane? In this lab study we tested carbohydrates such as starch and glucose‚ as well as solutions like Benedict’s and Lugol’s to see if they would cross the membrane of a cell but since we can’t actually see that happen we used dialysis tubing (acts as the cell membrane). • My prediction was that glucose and Benedict’s could pass the semi-permeable membrane but starch and Lugol’s wouldn’t be able to. • The purpose of this
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respiration. It is the ultimate source of energy for biochemical reactions in a cell. . A) ATP A. Anaphase | B. Telophase | C. Metaphase | D. Late prophase | E. Early prophase | B Chromosomes decoil to form chromatin. E Centrioles move to opposite ends of the cell. A Chromosomal centromeres split and chromosomes migrate to opposite ends of the cell. C Chromosomes align on the spindle equator. D Nuclear membrane and nucleolus disintegrate. Carbohydrates are stored in the liver and
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are made of cells that have similar structural characteristics * Outline the historical development of the cell theory‚ in particular the contributions of Robert Hooke and Robert Brown Robert Hooke was the first person to observe a cell through a compound microscope in 1665. Franscesco Redi used a microscope to observe that flies do not spontaneously appear but develop from eggs laid by other flies. Many years later‚ Robert Brown observed a large body in both animal and plant cells that he named
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Proteins on Strike! 1. What is the meaning behind the PHOSPHOLIPIDS’ chant? Phospholipids make up most of the cell membrane‚ in a phospholipid bilayer. Phospholipid molecules form two layers‚ with the hydrophilic (water loving) head facing the extracellular fluid and the cytosol (intracellular) fluid‚ and the hydrophobic (not water loving) tails facing one another. The cell membrane is constructed in such a way that it is semipermeable‚ and allows oxygen‚ CO2 and lipid soluble molecules through
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When a beetroot cell is exposed to various kinds of temperatures‚ its plasma membrane is affected and may change in structure resulting in the leaking of betacyanin. If the temperature changes‚ then I would expect to observe that there would be a change in the concentration of betacyanin that has leaked from a beetroot cell. In specific‚ at high temperatures‚ the phospholipids that make up the plasma membrane of the beet root cell become progressively more destabilized causing them to transform into
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have irreversible damage due to the advanced stage of the condition. When Joseph’s heart stopped working in the park the cells that make up the heart started to use up the remaining ATP that was left in the cells. Because there was no heart function to push oxygenated blood through the vessels the carbon dioxide levels started to increase and PH levels dropped within the cell. The heart was no longer providing blood flow with the rich oxygen and glucose to the mitochondria‚ which is needed for the
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communication. 1. Describe methods and processes of cellular communication. 2. What are cell junctions‚ and describe their two main functions. 3. Identify the eight specialized functions of a cell‚ and briefly describe each function. 4. Describe the three ways that cells adhere to each other to form tissues and organs. 5. Describe cellular metabolism‚ and discuss the components involved. 6. Explain cell membrane fluidity according to the fluid mosaic model. 7. Briefly describe the three phases of
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blood cells are attracted to open areas‚ to prevent infection Gas Exchange System: o Mucus lines the passageways trapping invading pathogens o These are moved to the top of the system by wafting cilia‚ to be removed o Macrophages remove any pathogens that get beyond the mucus Digestive System: o Mucus is antiseptic to kill bacteria o Gastric juice contains HCL which has a low pH to kill bacteria‚ by denaturing the pathogen’s enzymes and protease which digests the bacterial cell wall which
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