Answer the following questions true (T) or false (F)
1. The term "semiconservative replication" means that both strands of a DNA molecule are a mix of newly replicated and original template DNA.
2. Most bacteria have a natural ability to take up DNA from their environment.
3. The structure of DNA explains both its ability to encode genetic information and the way in which it is copied during cell reproduction.
1. FALSE
2. FALSE
3. TRUE
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In a prokaryotic operon, the region to which RNA polymerase binds is called
a. the heterogeneous nuclear DNA. b. the repressor gene. c. the promoter sequence. d. the operator sequence. e. all enhancer gene.
The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would
a. protect the animal from osmotic pressure. b. be a disadvantage for these organisms and lead to their death and fossil formation. c. protect the animal from predators. d. make these animals more desirable to predators. e. allow the animals to move into different environments easily.
Which of the following statements concerning cryptochrome is FALSE?
a. It is implicated in resetting the biological clock. b. It is a "clock protein." c. It absorbs green light. d. Its counterparts are found in fruit flies and mice. e. It sometimes interacts with phytochrome.
As an example of a(n) _____, household bleach can be characterized as having a _____.
A) neutral solution; pH of more than 10 B) base; pH greater than 7 C) base; pH less than 7 D) acid; proton concentration less than 1 x 10-7M