In a gene knock-in experiment, ________
A) the effect is exactly the same as a knockout
B) the animal gene of interest is replaced with the human counterpart gene
C) the gene is non-functional
D) the embryo cannot survive to birth
E) the gene product is produced to at least twice the normal levels
B
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Which of the following is a rocky, layered structure that forms over time as a mat of aquatic prokaryotic cells traps sediments?
A. Ozone layer B. Stromatolite C. Petroglyphs D. Stalactites E. Foraminifera
Continuous cell cultures are developed from (embryonic/haploid/neoplastic) cells.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not an electron carrier that participates in the electron-transport chain?
(a) cytochrome (b) quinone (c) rhodopsin (d) copper ion
Please choose the statement that best describes the immunologic basis of organ or tissue rejection after transplantation.
A) Specific T cell populations recognize non-self MHC molecules on transplanted tissue and mount a cell-mediated immune response damaging the transplant. B) Transplanted tissue is normally rejected only if it becomes infected. C) Organ/tissue transplant rejection is mostly due to Type 2 cytotoxic reactions mediated by IgG and IgM. D) IgE antibodies as well as basophils and mast cells attack the transplanted tissue if they recognize it as "non-self."