The ubiquitin-proteasome pathway
_____ is used to regulate expression of a number of cell surface receptors.
_____ requires only one molecule of ATP to target a protein.
_____ targets proteins in a stepwise fashion via ubiquitin ligase adding ubiquitin residues to the protein.
_____ is used to digest macromolecules.
_____ does not destroy the ubiquitin moiety, but rather cleaves it off for reuse.
__X__ is used to regulate expression of a number of cell surface receptors.
_____ requires only one molecule of ATP to target a protein.
__X__ targets proteins in a stepwise fashion via ubiquitin ligase adding ubiquitin residues to the protein.
_____ is used to digest macromolecules.
__X__ does not destroy the ubiquitin moiety, but rather cleaves it off for reuse.
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Birds generate a lot of heat, especially during flight. Yet the adipose tissue under their skin and the feathers atop their skin make it difficult to eliminate excess heat across the skin
Which of the following alternatives can absorb body heat and eliminate it from the bird most effectively? A) air in the air sacs B) lymph in the lymphatic vessels C) blood in the vessels D) blood in the heart E) urine in the bladder
One of a pair of glands that produces fluid that nourishes sperm and assists movement of sperm in the female reproductive tract. _____
A) Endometrium B) Testis C) Cervix D) Uterus E) Oviduct F) Ovaries G) Vagina H) Seminal vesicle I) Penis J) Prostate gland K) Vas deferens L) Glans penis
Hardy-Weinberg conditions were established in the lake after the asteroid hit. The fish population mated and produced the next generation. Scientists sampled 100 fish that were all offspring of the post-asteroid population. How many yellow fish will be among the 100 offspring sampled?
A) 4 B) 8 C) 15 D) 30 E) 32
In countries where the number of children younger than 15 is approximately equal to the number between ages 15 and 45, the population is
A) shrinking slightly. B) growing exponentially. C) stable. D) declining drastically. E) expanding slowly.