Which of the following best describes the tRNA binding sites of the ribosome?
A. Only one of the three sites can be occupied by a tRNA molecule at any given time.
B. Each tRNA that associates with the ribosome must first bind in the P site and then move to the A site.
C. The P site contains the tRNA molecule covalently bound to the growing chain of amino acids.
D. All tRNAs leave the ribosome through the A site.
C
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Which type of plant hormone can be produced by boiling DNA?
a. salicylic acid b. auxins c. cytokinins d. abscisic acid e. jasmonates
Tamoxifen blocks the activity of estrogen in ____, but increases the activity of estrogen in ____
a. breast tissue; ovarian tissue b. uterine tissue; ovarian tissue c. uterine, tissue; breast tissue d. breast tissue; uterine tissue e. brain tissue; breast tissue
The phospholipids of a cellular membrane will have their ____ ends facing each other (inside) and their ____ ends facing away from each other (outside).
A. hypotonic, hypertonic B. hypertonic, hypotonic C. hydrophilic, hydrophobic D. hydrophobic, hydrophilic
The stripes in skeletal muscle are due to the presence of
A. intercalated disks. B. the branching of cells. C. multiple nuclei per cell. D. actin and myosin filaments. E. tendons connecting the muscle to bone.