In which cells do erasure and re-establishment of imprinting marks typically NOT occur?

A. Nurse cells
B. Sperm cells
C. Oocytes
D. Somatic cells


D

Biology & Microbiology

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At an atmospheric pressure of 870 mm Hg with 21 percent oxygen, the partial pressure of oxygen is _____

A) 100 mm Hg B) 127 mm Hg C) 151 mm Hg D) 182 mm Hg E) 219 mm Hg

Biology & Microbiology

Answer the following statements true (T) or false (F)

1. If a researcher determines that 25% of a liver cell's total genome encodes genes for metabolic enzymes, then he/she should assume that metabolic enzymes make up 25% of the total protein composition of the cell. 2. Liver and muscle cells have different sets of genes. 3. A single pre-mRNA can be alternatively spliced into more than one type of mRNA. 4. If an acetyl group is added post-translationally to a protein, it can be subsequently removed.

Biology & Microbiology

The nucleotide sequence encoded in a gene defines the ____ that make up proteins

a. phosphate groups b. polypeptides c. ribosomes d. haplotypes e. amino acids

Biology & Microbiology

Let Y1i be the output for factory i when it receives a new machine, and let Y0i be the output for factory i when it does not receive a new machine. Also let Yi be the realized output for factory i and let Di be a binary variable that equals one if factory i actually received a new machine. If the company's headquarters randomly assigns new machines to a subset of the company's factories, this ensures:

A. E(Yi|Di = 0) - E(Yi|Di = 1) = E(Y1i - Y0i) B. E(Yi|Di = 1) - E(Yi|Di = 0) = E(Y1i - Y0i) C. E(Yi|Di = 1) = E(Yi|Di = 0) D. E(Yi|Di = 1) = E(Y1i - Y0i)

Biology & Microbiology