Ques:Q: Dna is normally found within what region of a cell? Read this paragraph and choose the correct option from the provided answers: the nucleus. The nucleus contains one or more nucleoli, which serve as sites for ribosome synthesis. The nucleus houses the genetic material of the cell: DNA. DNA is normally found as a loosely contained structure called chromatin within the nucleus, where it is wound up and associated with a variety of histone proteins. When a cell is about to divide, the chromatin coils tightly and condenses to form chromosomes. There is a pool of cells constantly dividing within your body. The result is billions of new cells being created each day. Before any cell is ready to divide, it must replicate its DNA so that each new daughter cell will receive an exact copy of the organism's genome. A variety of enzymes are enlisted during DNA replication. These enzymes unwind the DNA molecule, separate the two strands, and assist with the building of complementary strands along each parent strand. The original DNA strands serve as templates from which the nucleotide sequence of the new strands are determined and synthesized. When replication is completed, two identical DNA molecules exist. Each one contains one original strand and one newly synthesized complementary strand. Choices: - genome sequence - mitochondria - Golgi apparatus - nucleus A:

Ans:nucleus
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Ques:Q: What basic plant structure facilitates dispersal of pollen and fruit by raising reproductive structures? Read this paragraph and choose the correct option from the provided answers: Choices: - root - leaf - flower - stem A:

Ans:stem
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Ques:Q: Deficiency of what mineral causes bones to become porous and weak? Read this paragraph and choose the correct option from the provided answers: disease in which the bones become porous and weak because they do not contain enough calcium. Choices: - potassium - magnesium - zinc - calcium A:

Ans:calcium
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Ques:Q: What is required for interconversion between the two forms of an isomeric pair? Read this paragraph and choose the correct option from the provided answers: Stereoisomers Molecules with the same connectivity but different arrangements of the atoms in space are called stereoisomers. There are two types of stereoisomers: geometric and optical. Geometric isomers differ in the relative position(s) of substituents in a rigid molecule. (For more information on stereoisomers, see Chapter 23 "The ", Section 23.4 "Coordination Compounds". ) Simple rotation about a CC bond in an alkene, for example, cannot occur because of the presence of the bond. The substituents are therefore rigidly locked into a particular spatial arrangement (part (a) in Figure 2.16 "Some Simple (a) Alkenes, (b) Alkynes, and (c) Cyclic Hydrocarbons"). Thus a carboncarbon multiple bond, or in some cases a ring, prevents one geometric isomer from being readily converted to the other. The members of an isomeric pair are identified as either cis or trans, and interconversion between the two forms requires breaking and reforming one or more bonds. Because their structural difference causes them to have different physical and chemical properties, cis and trans isomers are actually two distinct chemical compounds. Choices: - couple and reforming - fixing and reforming - turn and reforming - breaking and reforming A:

Ans:
breaking and reforming
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