Which event occurs during the elongation
stage?
a. Peptide bonds form.
b. Free amino acids bind to the mRNA
binding site.
c. Anticodons bind to complementary codons.
d. A STOP codon enters the ribosome.
e. Peptide bonds form, and anticodons bind to
complementary codons
E
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The wet mount and Gram stain of vaginal secretions from a patient who has bacterial vaginosis caused by Gardnerella vaginalis will reveal large:
a. squamous epithelial cells with numerous attached pleomorphic gram-variable or gram-negative coccobacilli and rods. b. numbers of large gram-positive rods. c. numbers of polymorphonuclear leuko-cytes. d. pleomorphic gram-negative rods with many leukocytes.
Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Humans who have mutations in the presenilin genes are at a higher risk for developing early-onset Alzheimer's disease
The human presenilin proteins that are made from these genes are responsible for altering other proteins by cleaving (cutting) them at specific positions. Presenilin proteins that are highly similar to the human ones have been identified in C. elegans, a microscopic nematode worm. These nematodes do not get Alzheimer's disease, as they do not have a brain. What would you expect the function of nematode presenilins to be? A) They are responsible for the development of the central nervous system. B) They are responsible for altering other proteins by cleaving them. C) They are responsible for transporting proteins to a new location within cells. D) They are responsible for the synthesis of new proteins.
Who is credited with proposing that prebiotic chemical conditions could lead to the evolution of complex molecules and, eventually, to living organisms?
A) Alexander Oparin and John Haldane B) Stanley Miller C) Francisco Redi D) Louis Pasteur E) Sidney Altman