QUESTION 44 AI of the following transgenic organisms have been sold as food exce
ID: 271680 • Letter: Q
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QUESTION 44 AI of the following transgenic organisms have been sold as food except O potatoes pork rice corn QUESTION 45 The incidence of Down's syndrome increases with the age of the mother o True O False QUESTION 46 DNA transcription takes place in the nucleus. True O False QUESTION 47 The characteristic of DNA that allows it to make an exact copy of itself is its O complementary base pairing Osugar-phosphate backbone o twisting of the molecule to form an alpha helix O phosphodiester bonding of the helices QUESTION 48 Which of the following molecules transfers information from the nucleus to the cytoplasm? O tRNA mRNA O DNA O rRNA QUESTION 49 Alternative versions of a gene are called alleles True False QUESTION 50 Linked genes are located on different chromosomes. True O FalseExplanation / Answer
Answer 44. B. Pork.
Transgenic foods or genetically modified foods are foods which are derived from organisms whose genetic material has been altered in a way that does not occur naturally and which enhance the food quality. Currently available genetically modified foods stem mostly from plants like potatoes, cottonseed, tomatoes corn, rice, papaya, canola, are the best examples of transgenic foods, not from microorganisms or animals.
Answer 45. A. True.
Genetic material is stored in genes in nucleus of cells, where this gene carries the information which is responsible for all of our inherited traits and is grouped along rod-like structures called chromosomes. The nucleus of each cell contains 23 pairs of chromosomes, half of which are inherited from each parent. Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. It is usually caused by an error in cell division called Nondisjunction which leaded to abnormal cell division during the development of the sperm cell or the egg cell.
Answer. 46. A True.
The synthesis of RNA from DNA is Transcription which occurs in nucleus of a cell. It is a process by which genetic information encoded in DNA is transferred. The process of transcription is followed in few steps i.e. attach, split, copy, release. A promoter is a sequence of DNA at the beginning of a gene that signals RNA polymerase to begin transcription. RNA polymerase is an enzyme which required for transcription. Here the RNA polymerase bonds to DNA molecule to separate it and then a single RNA strand is made & RNA polymerase puts DNA back together. All RNA are made this way i.e. tRNA, rRNA, mRNA., snRNA.
mRNA is a End product of transcription.
Answer. 47. A. Complementary base pairing.
The two strands of a DNA molecule have complementary base pairs. If the two strands of a DNA molecule are separated, each can be used as a pattern or template to produce a complementary strand. Each template and its new complement together then form a new DNA double helix, identical to the original.
Answer. 48. B. mRNA.
mRNA are used to convey genetic information from the nucleus to the cytoplasm.The process is called translaton which have three steps: Initiation, Elongation, termination.
Answer. 49. True.
Alternative versions of a gene are called alleles.
An allele is a variant form of a gene which are located on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. Each pair of alleles represents the genotype of a specific gene. Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ. Alleles contribute to the organism's phenotype, which is the outward appearance of the organism.
Answer. 50. B False.
Genes on separate chromosomes are never linked. Each gamete gets a single copy, determined at random, of each chromosome. Because there is nothing holding them together, the alleles can pass to gametes in any combination.
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