In the rumen, the carbohydrate fermentation end products include ________.
A. methane
B. acetate
C. carbon dioxide
D. All of the choices are correct.
Answer: D
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Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. oxygen B. hydrogen C. carbon D. nitrogen E. sulfur
The episome in an Hfr strain is inserted near the trp (tryptophan operon) locus. This Hfr strain is grown with an F- Trp- strain. From this mating, we isolate an F+ Trp+ strain that can readily impart the Trp+ phenotype to F- Trp- strains, but no other traits are ever transferred. (When the original Hfr strain is mated with F? strains, traits other than Trp+ can be transferred, although at lower frequency than Trp+.) What most likely has happened?
A) An F? trp+ plasmid has been generated. B) Mutation occurred. C) Transduction occurred. D) Transformation occurred.
Which of the following cells are diploid?
a. sperm b. primary spermatocytes c. secondary spermatocytes d. male germ cells e. both primary spermatocytes and male germ cells
Identify which of the following scenarios is most probable for the evolution of members of genus Homo.
A. Australopithecus afarensis gave rise to Homo habilis who gave rise to Homo ergaster who gave rise to Homo erectus B. Ardipithecus ramidis gave rise to Homo habilis who gave rise to Homo ergaster who gave rise to Homo erectus C. Australopithecus afarensis gave rise to Homo habilis who gave rise to Homo sapiens who gave rise to Homo erectus D. Australopithecus afarensis gave rise to Homo erectus who gave rise to Homo ergaster who gave rise to Homo habilis