Which of the following is NOT part of the structure of the nucleosome core particle?
A. It is composed of an octamer of proteins.
B. There is a linker region between two nucleosomes of about 200 base pairs.
C. There are two copies each of H2A, H2B, H3 and H4.
D. The DNA is wrapped around the core slightly over two complete turns
E. The DNA wrapped around the core contains 146-147 base pairs.
D
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Protein disulfide isomerase:
A. reduces disulfide bonds. B. facilitates posttranslational modification of a protein. C. catalyzes the breakage and formation of disulfide bonds. D. reduces disulfide bonds and facilitates posttranslational modification of a protein. E. reduces disulfide bonds, facilitates posttranslational modification of a protein, and catalyzes the breakage and formation of disulfide bonds.
_______ allow the body to remain immune to a pathogen that the immune system has encountered in the past.
a. Cytotoxic T cells b. Dendritic cells c. Antigen-presenting cells d. Memory B cells
Which bone joins the lower end of the humerus to form the elbow joint?
a. scapula b. carpal c. radius d. ulna e. clavicle
Which of the following is true about the genetic code?
A. All organisms use essentially the same genetic code. B. The codon signaling the end of transcription also codes for an amino acid. C. There are multiple codons signaling the start of transcription. D. Each amino acid is specified by only one codon. E. A codon is three to six bases long.