Sister chromatids are
A. genetically identical and attached to each other at the centromere.
B. genetically identical.
C. genetically different.
D. genetically different and attached to each other at the centromere.
E. attached to each other at the centromere.
A. genetically identical and attached to each other at the centromere.
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You have just invented a time machine and you want to investigate the past (the dream of every paleontologist!). When is the earliest time in Earth history that you could go back and not have to have an oxygen tank so that you could breathe normally?
A. Cambrian Period B. Phanerozoic Eon C. Archaean Eon D. Quaternary Period E. Devonian Period
Which gas is increasing in the atmosphere and threatening the world with the greenhouse effect?
a. carbon dioxide b. carbon monoxide c. ozone d. fluorocarbon e. oxygen
The female hormones that participate in milk
production for and delivery to the newborn are a. prolactin and oxytocin. b. prolactin and estrogen. c. prolactin and progesterone. d. oxytocin and estrogen. e. oxytocin and progesterone.
TATA-binding protein (TBP) is required for initiation by
a. RNA polymerases I, II, and III. b. RNA polymerases I and III. c. RNA polymerase II. d. RNA polymerase III. e. RNA polymerase I.