Tunicates have which of the following traits?
A. radial symmetry
B. incomplete digestive tract
C. asymmetry
D. pharyngeal slits
E. endothermic
D. pharyngeal slits
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Exploring in the tropics, you discover a nonvascular plant that produces pollen. What type of plant have you discovered?
A) an angiosperm B) a fern C) a bryophyte D) an entirely new type that you will get to name
Translation proceeds in a series of steps in the active site of the ribosome. Which of the following are important steps in polypeptide formation?
A. The incoming aminoacyl-tRNA forms a covalent bond with the RNA in the A site. B. The hydrogen bonds formed between ribosomal RNA and tRNAs position the aminoacyl-tRNAs to catalyze peptide bond formation. C. The tRNA holding the growing polypeptide moves from the P site to the A site after peptide bond formation. D. The RNA in the P site makes hydrogen bonds with the 3' end of the aminoacyl-tRNA.
What is the primary reason internal homeostasis must be maintained?
A) Most organisms have not evolved mechanisms to control positive feedback systems. B) Enzymes must retain their correct three-dimensional structure. C) Homeostasis prevents the wasting of stockpiles of coenzymes. D) Unregulated variations cause the cells' DNA to mutate. E) Wide swings in the internal environment interfere with normal metabolic reactions.
Please match the term with its description.
Destruction of vegetative pathogens on skin and tissue A) Sterilization B) Disinfection C) Antisepsis D) Asepsis E) Sanitization