DNA methylation is associated with a. Increased transcription b. Decrease recomb
ID: 300180 • Letter: D
Question
DNA methylation is associated with a. Increased transcription b. Decrease recombination c. Decondensed chromatin d. Increased recombination e. Decrease transcription Fetal testing enables us to examine possible chromosomal abnormalities. The technique that is used to isolate fluid surrounding the fetus that contains fetal cells is called: a. Chronic villus sampling b. Ultrasound c. Amniocentesis d. Placentiosis e. Fetoscopy Which of the following mutational changes would you predict to be the most deleterious to gene function? a. Insertion of a single nucleotide near the beginning of the coding sequence b. Insertion of three consecutive nucleotides in the middle of the coding sequence c. Substitution of one nucleotide for another in the middle of the coding sequence d. Deletion of three consecutive nucleotides in the middle of the coding sequence e. Substitution of one nucleotide near the end of the coding sequence Which of the following statements about the newly synthesized strand of a human chromosome is correct? a. It was synthesized from a single origin solely by continuous DNA synthesis b. It was synthesized from a single origin solely by discontinuous DNA synthesis c. It was synthesized from a multiple origins solely by a mixture of continuous and discontinuous DNA synthesis d. It was synthesized from a multiple origins solely by discontinuous DNA synthesis e. It was synthesized from a single origin solely by a mixture of continuous and discontinuous DNA synthesis The ______ are made up of DNA wrapped around bistones. a. Nucleosomes b. 300 nm fibers c. motifs d. looped domains e. linkers When a T2 bacteriophage infects an E. coli, which part of the phage enters the cell? a. Only the DNA b. Only the RNA c. The whole phage d. The protein "headpiece" and its enclosed nucleic acid e. Only the neck of the virusExplanation / Answer
18) DNA methylation decreases transcription
19)Amneocentresis is the process of sampling small amount of fluid surronding the feutus. The fluid is called amniotic fluid in the amniotic sac which surrounds the developing fetus.
20) The most deleterious mutation is insertion of single nucleotide near the begining of the coding region. This will lead to change in the complete reading frame by shifting the frame and hence the protein sequence will change.
21)d
22) Nucleosomes are made of DNA wrapped around histones.
23) Only DNA enters the cell
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