Which of the following statements concerning leucine zipper proteins is FALSE?
a. They are transcription factors.
b. They contain loops held together by zinc ions.
c. They form homodimers.
d. They form heterodimers.
e. They contain DNA-binding domains.
B
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Which of the following statements about biofilms is true?
a. They are formed by prokaryotes living in a watery environment. b. They may develop on surgical implants. c. An example is dental plaque. d. They are formed by prokaryotes living in a watery environment and they may develop on surgical implants. e. They are formed by prokaryotes living in a watery environment, they may develop on surgical implants, and an example is dental plaque.
A(n) ________ is a recording of the electrical activities of the heart
Fill in the blank(s) with correct word
Over the past 500 million years, ____ mass extinctions have occurred in which at least ____ of the species on earth have become extinct
a. two...25% b. two...50% c. five...25% d. five...50% e. twelve...96%
The studies of alkaptonuria provided the first evidence of a connection between genes and metabolism. Who conducted these studies?
a. Archibald Garrod b. Watson and Crick c. Frederick Griffith d. Beadle and Tatum