Which structures are found along lymphatic vessels but are heavily clustered in the armpit, groin, and neck?
A. spleen
B. lymph nodes
C. galt
D. thymus
E. tonsils
Answer: B
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Zhang and Cech’s experiments confirmed which feature of ribozyme activity?
a. Ribozymes inhibit rates of biological reactions. b. Ribozymes catalyze formation of bonds between amino acids in protein synthesis. c. Ribozymes catalyze formation of the fundamental linkage tying nucleic acids to proteins. d. Ribozymes can link nucleic acids together even if their proteins are removed. e. Ribozymes provide a possible solution to the question of whether proteins or nucleic acids appeared first in evolution.
Mutations in the TATA box increase the rate of transcription
__________________ Indicate whether the statement is true or false.
Which of these groups is characterized by a lack of symmetry (neither radial nor bilateral)?
A) Cnidarians B) Chordates C) Arthropods D) Flatworms E) Sponges
The earliest known land plants date to the
A) Pleistocene (late Cenozoic era). B) Ordovician (early Paleozoic era). C) Carboniferous (late Paleozoic era). D) Jurassic (middle Mesozoic era).