Proteins whose conformations change when they are bound to an effector molecule are called
A) enzymes.
B) allosteric proteins.
C) regulatory proteins.
D) activator proteins.
E) inhibitory proteins.
B) allosteric proteins.
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Stromatolites are
A. layered rocklike structures formed by some cyanobacteria (blue-green algae). B. the earliest known arthropods. C. found only in rocks of Carboniferous age. D. the earliest known arthropods and found only in rocks of Carboniferous age are correct. E. fossilized coral reefs.
Which feature of a plasmid cloning vector is necessary for the plasmid to be replicated inside a host cell?
a. lacZ+ gene b. ampicillin resistance gene c. origin of replication d. ribosomal binding site e. restriction site
Which of the following proteins attaches a crawling cell to the substrate in a focal adhesion?
A) actin B) myosins C) ?-actinin D) integrin E) titin
How many years is the average life span of a species on Earth?
A) 1000 B) 100,000 C) 1 million D) 100 million