Which pieces of evidence support the radial loop-scaffold model of DNA packaging?
A) Histone-depleted metaphase chromosomes still maintain their X-like shapes.
B) Radial loop-scaffold DNA has been isolated and crystallized.
C) Topoisomerase II assists in 100 Å packaging.
D) Each G band formed by Giemsa staining represents a chromatin loop.
C) Topoisomerase II assists in 100 Å packaging.
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Which reproduction method is associated with sexual reproduction?
A. fission B. fragmentation C. gamete production
Which of the following statements is false?
A) Translation consists of initiation, elongation, and termination. B) During polypeptide initiation, an mRNA molecule, the first amino acid attached to its tRNA, and the two subunits of a ribosome are brought together. C) The start codon can be different depending on what kind of protein is to be translated. D) During the first step of initiation, an mRNA molecule binds to a small ribosomal subunit.
Echinoderms are unique in their (choose all that apply)
A. five-fold symmetry. B. skeletons made of interlocking plates of protein. C. water vascular system. D. Skeletons made of interlocking plates of calcite E. Filter feeding
How long ago did the hominin lineage, the human branch of the evolutionary tree of life, split away from other primate groups?
A. About 60 million years ago B. About 600 thousand years ago C. About 6 million years ago D. About 6 thousand years ago