Which structure is involved in the initiation stage?
a. a specific tRNA
b. an mRNA transcript
c. a small ribosomal subunit
d. a large ribosomal subunit
e. all of these
Answer: e
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If a portion of a transcription factor's domain is the same in a variety of organisms, it is called a motif
Indicate whether the statement is true or false
How did Zhang and Cech purify the RNA molecules that were able to catalyze the linkage between two amino acids?
a. passing the reaction mixture through a column that binds biotin b. passing the reaction mixture through a column that binds all proteins c. passing the reaction mixture through a column that binds RNA d. centrifuging the reaction mixture to concentrate the proteins e. centrifuging the reaction mixture to concentrate the RNA molecules
Which statement is false?
a. Calcium is the most important mineral involved with bone tissue turnover. b. Osteoblasts and osteoclasts are involved with the reabsorption and repair of bones. c. Bone mass decreases with age. d. Males have greater problems with loss of bone tissue than females do. e. Marrow fills the cavities in the spaces of the spongy bone and in the center of the shaft of the bone almost as quickly as the spaces are formed.
In corn and other monocots, a rigid sheath called a __________ surrounds and protects the plumula.
A. coleoptile B. anatomy C. hypocotyl D. radicle E. sporophyte