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Indicate whether each of the following statements about covalent bonds is true or false. 1. A water molecule is held together by two single polar covalent bonds. 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with two partial negative charges near the oxygen atom and one partial positive charge near each hydrogen atom. 3. Atoms differ in their affinity for neutrons, a property called electronegativity. 4. In general, electronegativity increases from left to right across each row of the periodic table and also increases down each column. 5. In a nonpolar covalent bond there is an equal sharing of electrons between two atoms while polar covalent bonds involve an unequal sharing of electrons. 6. A single molecule of oxygen (O2) is held together by two double nonpolar covalent bonds. 7. A covalent bond is formed when two atoms share one or more pairs of electrons. 8. Polar molecules are electrically neutral but the distribution of charge within the molecule is not uniform. 9. Although C and H differ slightly in electronegativity, this small difference is negligible, and C-H bonds are considered polar. 10. Of the 4 most common elements found in living organisms, nitrogen has the highest electronegativity and, therefore, the greatest affinity for electrons. 11. A slightly positive hydrogen atom on one water molecule can attract the slightly negative oxygen atom on a different water molecule, leading to the formation of a hydrogen bond.
Compare and contrast aerobic respiration, anaerobic respiration, and fermentation and how do antibiotics work? Why do they kill pathogens without harming us?
why is Coral reefs are decreasing in size globally?
During the catalytic cycle of pyruvate dehydrogenase, pyruvate becomes covalently attached to a prosthetic group, thiamine pyrophosphate.
Provide two signs of SCID. Explain two options for expecting parents who have family members with SCID and are concerned their child will be affected with the immunodeficiency.
Suppose after washing your hands, you leave ten bacterial cells on the new bar of soap. You next decide to do a plate count of the soap after it is left in the soap dish for 24 hours. You dilute 1g of the soap 1:10 and plate it on a standard plate co..
Imagine that you have engineered a set of genes, each encoding a protein with a pair of conflicting signal sequences that specify different compartments. If the genes were expressed in a cell, predict which signal would win out for the following c..
Transcription factor X binds to a response element in gene A and gene B. In muscle cells, transcription factor X activates transcription of gene A. In neuronal cells,
What phenotypes will you suppose among the 1024 offspring, and how many of each phenotype would you expect.Suppose that a cross is made between a fly with normal wings.
Two consecutive crosses, with the first between pure-breeding parents that differ in two phenotypes to create an F1 generation, and the second in two F1 progeny to create an F2 generation.
why do streptomycin-resistant bacterial strains decrease over time in a non-selective environment?
What would be the genotype and genotype ratio if you crossed wild-type (dominant) female flies with white-eyed (recessive) male flies?
With patient in a supine position, you asked him to lift his head. You noticed that the abdominal muscles contract. What do you think is the reason behind this motion?
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