What do cytotoxic T cells interact with?
A. MHC class I proteins and viral or cancer cell peptides
B. MHC class I and MHC class II proteins
C. Viral or cancer cell peptides only
D. MHC class I proteins only
E. MHC class II proteins and viral or cancer cell peptides
F. MHC class II proteins only
Answer: A
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Post-translational regulation of an enzyme's activity, such as glutamine synthetase, can be finely controlled at varied levels due to
A) the varied strengths metabolite-regulating compounds can have with the enzyme such as hydrogen bonding, covalent bonding, and van der Waals attractions. B) having multiple independently functional subunits. C) the structural strength enzymes have once properly folded compared to short-lived and easily degradable transcripts during translational regulation. D) weak chemical modifications of the enzyme rather than harsh protein-protein or protein-DNA interactions.
Changes in ________ represent the predominant cause for biological evolution.
A. homeostasis B. growth and development C. reproduction D. genetic makeup E. energy
In open-water ecosystems, decomposition occurs primarily in the
A) thermocline. B) hypolimnion. C) epilimnion. D) benthic zone.
What is the name of the proteins that make up the nuclear lamina and of what protein superfamily are they a member?
a) keratin, intermediate filaments b) lamins, laminins c) keratin, laminins d) lamins, intermediate filaments e) actin, microfilaments