Answer the following questions by selecting the most appropriate answer One of t

Question

Answer the following questions by selecting the most appropriate answer One of the notable features of carbon is that its valence is 1 2 3 4 5 If the difference in electronegativity between two atoms is very snail, which type of bond will likely form? Polar covalent Nor.-polar covalent Ionic Hydrogen Bo bonds will form which of the following is not a property of water? High specific heat Low heat of vaporization High surface tension Liquid water is less dense than ice Universal solvent Which of the following types of macromolecules always contain(s) nitrogen? Carbohydrates Lipids Amino Acids Nucleic Acids C and D Prokaryotic cells do not contain which of the following structure(s)? Ribosomes Plasma membrane Golgi apparatus A and B A and C Which organelle is involved in cellular digestion? Smooth endoplasmic reticulum Rough endoplasmic reticulum Golgi body Lysosome Vacuole During DNA replication, which of the following enzymes acts first? Topoisomeriase DBA polymerase I DBA polymerase III DBA ligase Primate which of the following is not involved in post-transcriptional modifications? Splicing out of intones Splicing out of exons Addition of a 5'-guanine cap Addition of a 3' poly-A tail All are involved in post-transcriptional modifications Bow many nucleotides is a codon composed of? 1 2 3 6 It is variable During which stage of mitosis do the chromosomes migrate to either end of the cell? prophase promotaphase metaphase anaphase telophase

Explanation / Answer

1. Valence electrons are the electrons found in an atom's outer electron shell. One atom of carbon has four valence electrons. To know how many valence electrons are present in an element, look at the periodic table and find for the element's group. Carbon is in group four, so it has a valence of 4.

2. Non-polar covalent bond is formed when the electronegativity difference is very small. If the electronegativity difference is between 0.0-0.2, then the bond will be non-polar covalent. If the electronegativity difference is between 0.3-1.4, then the polar covalent bonds are formed. If the gap is greater than 1.5, the ionic bonds will be formed.

3. Water has high heat of vaporization. Water is in liquid form has an unusally high boiling point temperature, a value close to 100 degree celsius. As a result, the network of hydrogen bonding present between water molecules , a high input of energy is required to transform one gram of liquid water into vapor, an energy requirement called heat of vaporization.

4. The nucleotides in the nucleic acid has nitrogeneous bases which has nitrogen in it. The amino acids contains amine group (NH2). So both amino acid and nucleic acid contains nitrogen.

5. The prokaryotic cells are the basic type of cell which does not have any membrane bound organelle and nucleus. So, they lack golgi apparatus.

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