If chromatin is digested with the enzyme micrococcal nuclease and the resulting DNA is a size of some multiple of approximately 200 bp, what is the interpretation?
What will be an ideal response?
Ans: The interpretation of this result is that the original chromatin is organized into nucleosomes. The length of DNA that is protected from nuclease degradation when associated with a nucleosome averages about 200 bp.
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Mature red blood cells have no nucleus or mitochondria
Indicate whether the statement is true or false
Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates. Which of the following genes would you predict to be constitutively (constantly) expressed?
A) genes involved in the biosynthesis of the amino acid tryptophan B) genes involved in the degradation of tryptophan C) genes involved in the degradation of arabinose, a sugar D) genes that code for regulatory proteins
The Kaibab limestone layer of sedimentary rock is the closest to Earth’s surface; therefore ____
a. it contains fossils of extinct species only b. it contains the greatest density of fossils c. it is part of the K-Pg boundary sequence d. it is the oldest layer e. it is the youngest layer
The release of DDT into the environment to control some insect pests will result in the highest
detectable concentrations a. at the bottom of the food chain. b. in the targeted insect pest. c. in the middle of the food chain. d. at the end of the food chain. e. nowhere, because DDT is degraded rapidly.