The forward thrust of swimming sharks is created by:
a. the pectoral fins.
b. the pelvic fins.
c. the dorsal fin.
d. the caudal fin.
e. the anal fin.
D
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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.
The chemokine CCL2
A) attracts basophils, eosinophils, monocytes, and dendritic cells. B) stimulates production of inflammatory mediators. C) organizes an antigen specific immune response. D) attracts basophils, eosinophils, monocytes, and dendritic cells; stimulates production of inflammatory mediators; and organizes an antigen specific immune response.
Two of the main ingredients in plant fertilizer are phosphorus and nitrogen. These elements are required for the synthesis of __________________, respectively, in the cells of the plants
A. DNA and proteins B. proteins and complex carbohydrates C. complex carbohydrates and DNA
Enveloped viruses ____
a. generally lyse host cells as they are released b. synthesize envelope lipids as they replicate within the host cell c. acquire their envelope as they bud from the host cell d. acquire their envelope as they enter the host cell e. always contain DNA genomes