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Week 9 Exam notes

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BIOL 1070
Wright& Newmaster

Week 9 exam notes Thermoregulation in the arctic fox involves: thermoreceptors sending information to the hypothalamus if body temperature is above or below the set point. Plant leaves move in a rhythmic pattern on a 24 hour or circadian rhythm even when placed in darkness. In humans, hormones such as cortisol and melatonin fluctuate over a 24 hour period. Circadian rhythms (circa = "around"; diem = "day") oscillate with a period of approximately 24 hours. Acclimitization or adaptation? Abalone (Haliotis kamtschatkana) tolerate water temperatures of 4 - 10 C in the winter months, but 8- 1. acclimitization 14 C in the summer. The enzyme, lactate __1__ dehydrogenase is expressed in different forms 2. adaptation (isoforms) in the summer relative to the winter. Isoform switching helps to maintain enzyme function regardless of body termperature. Killer whale (Orcinus orca) herds form with a distinct __2__ age and sex structure. They primarily prey upon endotherms (eg. seals, porpoises, sea lions). In late March, the brown coat of ermine (Mustela erminea) first appears as a mid-dorsal stripe which __1__ gradually spreads to all parts of the body. In late October, the process is reversed and the white winter coat appears after the moult. The wolf (Canis lupus) has a similar appearance to a large German shepherd dog, but it is thinner and has __2__ longer legs and larger paws. The skull is relatively heavy and the teeth are large. They have diverse prey, but tend to kill 1 - 1.5 large animals each month. Collared lemming (Dicrostonyx torquatus) remodel their claws seasonally. In winter the pads of the third and fourth digit bulge and the claws above the pads, __1__ lengthen. These special claws are used to dig burrows through snowbanks. In the spring, claw growth slows and the pads return to a smaller size When salmon undergo acclimitization to different seasonal mean temperatures, the lethal temperature shifts, as shown below in the table. April AugustJanuary Me
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