Which of the following statements about eukaryotic DNA replication and the cell cycle is false?
a. the decision about whether to replicate is determined by a complex pathway that regulates the cell cycle
b. the duplicated chromosomes are segregated to daughter cells during mitosis at random
c. chromosomes reside in the nucleus
d. each chromosome consists of many replicons
e. replication requires coordination of the replicons to reproduce DNA during a discrete period of the cell cycle
Ans: b
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Ecomorphs are ____
a. distantly related members of the same genus that are morphologically and ecologically diverse b. closely related members of the same genus that are morphologically similar and ecologically diverse c. members of the same species that live in very different habitats d. distantly related members of the same genus that are morphologically and ecologically similar e. closely related members of the same genus that are morphologically and ecologically similar
In a medical emergency, when an individual has stopped breathing on their own, mouth-to-mouth resuscitation can be administered while waiting for the arrival of EMTs, in order to increase that individual’s odds of survival. In order to perform mouth-to-mouth resuscitation, air from a conscious individual’s lungs is forced into the lungs of the unconscious individual. What effect does this have?
a. Forcing air into the unconscious individual’s lungs triggers the sympathetic breathing reflex, whereby the lungs ”remember” to start breathing again. b. Mouth-to-mouth resuscitation prevents the unconscious individual from exhaling their residual volume, which would cause the lungs to collapse and lead to inevitable death. c. Some residual oxygen from the conscious individual’s lungs diffuses into the unconscious individual’s blood, and the increased pressure forces some CO2 saturated air out of their lungs. d. Mouth-to-mouth resuscitation keeps the alveoli of the lungs moist and warm, allowing the lungs to continue exchanging gases with the atmosphere on a passive but adequate level.
Which of the following is NOT found in every nucleic acid?
a. ribose b. phosphate group c. purine d. pyrimidine e. uracil
Under natural conditions without modern medicine, which of the following conditions has the LEAST impact on fitness?
A. Alzheimer disease, a neurological disorder that generally afflicts individuals over the age of 65 B. valvular stenosis, a birth defect resulting in a narrow valve that restricts blood flow from the heart C. amenorrhea, the inability to menstruate D. Tay-Sachs, a congenital (from the time of birth) disorder in which neurons degenerate