Which one of the following experimental results does not support the hypothesis that the ribosome is a ribozyme?
A. There are no proteins observed within 18Å of the peptidyl transferase active site in the crystal structure.
B. Peptidyl transferase activity is not inactivated by treating the ribosome with detergent.
C. Peptidyl transferase activity can be inactivated by base changes in the rRNA.
D. Ribosomes from thermophilic organisms are more stable than those from Escherichia coli.
D
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Why is energy lost when herbivores eat primary producers?
A) Primary producers have energy stored in indigestible substances. B) Primary producers cannot produce once eaten. C) Digestion takes place so rapidly that very little energy is absorbed. D) Most primary producers contain no usable energy for herbivores.
The human brain contains at least ____ neurons
a. 100 billion b. 100 million c. 500 million d. 100 thousand e. 50 million
In plants like the fern, haploid cells produced by meiosis divide by ________, forming a multicellular haploid phase.
A. budding B. mitosis C. meiosis D. binary fission
In what way are bacteria and fungi similar?
A. Ecological function B. Design of the nucleus C. Ribosome structure D. Cell wall components