Explain why relatives are sought for kidney transplants.
What will be an ideal response?
Cytotoxic T cells will attack any foreign version of the MHC protein, including those in transplanted tissues. Relatives have the closest genetic MHC proteins to the organ recipient.
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Which pieces of evidence support the radial loop-scaffold model of DNA packaging?
A) Histone-depleted metaphase chromosomes still maintain their X-like shapes. B) Radial loop-scaffold DNA has been isolated and crystallized. C) Topoisomerase II assists in 100 Å packaging. D) Each G band formed by Giemsa staining represents a chromatin loop.
A sarcomere shortens when _____
a. thick filaments shorten c. both thick and thin filaments shorten b. thin filaments shorten d. none of these
Similar body parts that reflect shared ancestry are called __________.
Fill in the blank(s) with the appropriate word(s).
What is a virion?
A. a virus genome inside a cell B. an empty capsid C. a single virus particle outside a cell D. an extracellular virus genome E. a virus genome integrated into a host cell genome