which histone is found in nucleosomes that coat the inactive X chromosome?
a. H1
b. H3.3
c. macroH2A
d. none of the above
macroH2A .
Variants of macroH2A like H2A1 and H2A2 ae responsible for inactivation of x chromosome.
which histone is found in nucleosomes that coat the inactive X chromosome? a. H1 b. H3.3...
How Many Nucleosomes in One Human X Chromosome? According to the Entrez Genome Database of the National Center for Biotechnology Information, the first human X chromosome to be sequenced contained 154,913,754 nucleotide pairs. If the DNA in this chromosome is organized into nucleosomes and the average internucleosome linker DNA contains 50 nucleotide pairs, how many nucleosomes will be present in this chromosome during interphase? How many molecules of histone H3 will be present in this X chromosome?
Which statement is true with respect to eukaryotic chromatin? A> histone post-translational modifications are lost b>None of the the other selections are true statements c> Euchromatin represents regions with hypoacetylation of histones that leads to densely packed nucleosomes and promotes transcription D> Euchromatin represents regions with hyperacetylation of histones that leads to loosely packed nucleosomes and promotes transcription
QUESTION 1 A nucleosome consists of A. a cluster of histone proteins that are wrapped around the DNA double helix. B. two peptides each of histones H2A, H2B, H3 and H4, wrapped by the DNA double helix. the DNA polymerase complex and the Okazaki fragments of approximately 200 bases in C. length. D. clusters of ribosomal large subunits and small subunits bound to the DNA double helix. E. one of each of the 5 types (H1 - H4) of histone...
Calico cats have a randomly patterned coat. Which of the following correctly describes why this occurs? A Two copies of the X chromosome are expressed in some portions of the cat’s fur, but in others, one of the copies of the X chromosome has been randomly silenced. B The gene for coat color is located on the Y chromosome, which is only expressed in regions of the body not important in sexual characteristics, including the fur. C The gene encoding...
ton is not an energy dependent process in (B)) Falls eukaryotes 43. Histone methylation is associated with Falls gene activation gene silencing Following histones are required during transcription (A) H2A and 2B (B) H3 (C) H4 (D) All of the above (E) H2AZ (c) induction (D) All of the above (E) None of the above 35. 4. DNA methylation silences gene expression AD True (B) Fall Leucine residues in lucine zipper proteins provides h ydrophobic interaction for dimerization (A) True...
Which of the following is not part of a human chromosome in any phase? A. centromere B. euchromatin C. nucleosome D. histone E. centriole
Which of the following process will lead to an optically inactive product A. Racemization B. Emiperization C. Asymmetric synthesis D. None of these
84. Each version of a gene is called a(n) a. allele. b. chromosome. c. histone. d. centromere. e. artifact. Matching: Choose the one most appropriate condtion from a - e for each of the descriptions below for numbers 85-89. Each answer is only used once a. Down's syndrome b. Huntington's disease or Huntington's chorea c. hemophilia d. Turner syndrome e. sickle cell anemia 85. Dominant deadly disease that occurs after the age of 30, affects nerves and movement 86. nondisjunction...
A mixture of equal amounts of two enantiomers ____. A) is optically inactive B) is called a racemic mixture C) implies that the enantiomers are meso forms D) both A and B E) none of the above Label each asymmetric carbon in the compound below as R or S.
7. The lambda L-chain gene cluster is on a, chromosome 32 chromosome 22 chromosome 14 .chromosome 2 e, the X-chromosome 28. Humoral immunity refers to which of the following elements? c. NK cells a. Antibodies b. Macrophages d. a and c e. a, b, and c ns of the antbody molecule which contribute MOST to the affity of the anibody for antigen are the а.framework regions b. Fab regions. SFc regions. g. CDRs. e. hinge regions. ement of Vi-J. and...