__________ contain identical DNA sequences and are held together by __________ during mitosis
a. Daughter chromosomes; hydrogen bonding
b. Daughter chromosomes; ionic bonding
c. Sister chromatids; spindle fibers
d. Sister chromosomes; histone proteins
e. Sister chromatids; centromeres
E
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What would you predict would happen in an area of the body where PO2 is relatively low?
a. O2 would bind more readily to hemoglobin b. CO2 would bind more readily to hemoglobin c. O2 would release from hemoglobin d. CO2 would release from hemoglobin e. binding of O2 by hemoglobin would cease
A signal peptidase
a. removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER. b. attaches a signal sequence to a growing polypeptide chain before it passes into the rough ER. c. attaches an acetyl group to the 5? end of a polypeptide after removal of the initial methionine. d. removes the initial methionine from a polypeptide chain.
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 carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. B. 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. C. 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. D. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes.
Some viral diseases require only one vaccination, which lasts for years. For other diseases like the flu, vaccinations last only one season. The flu vaccine lasts such a short time because the flu virus
A. is more easily transmitted B. mutates much more rapidly C. is less dangerous D. is much smaller