Why do chromosomes coil during mitosis?
A) to increase their potential energy
B) to allow the chromosomes to move without becoming entangled and breaking
C) to allow the chromosomes to fit within the nuclear envelope
D) to allow the sister chromatids to remain attached
E) to provide for the structure of the centromere
Ans: B) to allow the chromosomes to move without becoming entangled and breaking
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MAPKs are activated by
A) methylation. B) microtubules. C) membranes. D) mitogens. E) methionine.
A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere. What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?
A. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes. B. The younger rocks will have higher levels of carbon dioxide, because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste. C. The ratio of carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. D. The amount of carbon will vary unpredictably in the younger rocks, because rock weathering added carbon dioxide to the atmosphere, and volcanic activity sequestered it.
Lab coats, gloves, face masks, and goggles are all examples of
items supplied by your college or university personal protective equipment fashion items preferred by biology students
The neck of open culture tubes should be sterilized after removing the cap and before replacing the cap. Open tubes should always be ___________ to minimize the possibility of airborne contamination.
A) held at an angle B) labeled with tape C) carried in a sleeve D) inoculated with the nondominant hand