BIO120H1 Lecture Notes - Lecture 3: Sclerophyll, Outline Of Life Forms, Evaporation

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26 Apr 2011

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Reactions occur best at optimum temperature and osmotic conditions. Two types of range: range tolerance and geographical ranges. Animal ranges often correspond to biomes, i. e. , limited by climate and/or vegetation. Organismal digression: some animal ranges can transcend biomes (e. g. , the tiger can live in the cold or desert) Thermal ecology: aspects of heat exchange with environment. Conduction: direct contact with substrate (e. g. , feet lose heat to ground) Convection: heat transfer mediated by moving fluid (usually air or water) The larger the surface area, the slower the equilibration. If you are large, you can maintain your body heat easier. Bergmann"s rule: homeotherms tend to be larger at higher latitudes. (colder environments) Elephant don"t violate bergmann"s rule because of the wooly mammoths that have gone extinct but used to live in northern latitudes. E. g. , rabbits in the arctic and in the desert. More important than size or shape in heat regulation.

Related Questions

The combustion of glucose ultimately involves the transfer of electrons to oxygen (O2). In biological systems, this takes place without a large increase in temperature. Which of the following statements about this process in biological systems is true?

1) Coupled oxidation-reduction reactions occur with electrons being passed to intermediate electron carriers.
2) The process involves the transfer of 12 pairs of electrons to oxygen.
3) The transfer of electrons from intermediate electron carriers to molecular oxygen is catalyzed by the electron transport chain.
4) Though the process is a controlled oxidation, some energy is lost.

rubywater-buffalo762

-Did changes to sequence occur in the active(substrate binding)site? Why would a mutation in this area be a disadvantage andlikely not persist in a species?

-Why would a more flexible enzyme in a cold environment be anadvantage and a disadvantage? (include amount of substrate neededfor reaction and enzyme activity at various temperatures)

- How can temperature of an environment determine speciesdistributions at the biochemical(amino acid, DNA etcâ¦) level? Thinkin terms of DNA mutations, resulting proteins, fitness and naturalselection.

beigerabbit215

MOLECULAR BIO HELP

QUESTION 1

Which of these choices is an example of acclimatization?

		Plants growing in the shade grow larger leaves compared to the leaves growing in direct sunlight.
		A.Pigweed plants ( Amaranthus retroflexus ) growing in North Carolina are more tolerant to heat than plants growing in Canada.
		A.The quadrate bone of snakes is movable rather than rigidl y attached, as seen in other vertebrates.
		A.Desert rodents produce more concentrated urine because of their longer loop of Henle as compared to the loop of Henle found in other rodents living in less arid conditions.

10 points

QUESTION 2

Which of these choices is an example of connective tissue ?

		cardiac muscle
		neurons
		blood
		glial cells

10 points

QUESTION 3

Which of these choices best describes homeostasis ?

		A.maintenance of a relatively constant internal environment
		A.all vertebrates have a similar body plan
		A.exchange of materials with the environment a cell is found in
		A.relationship of the structure and function in animals

10 points

QUESTION 4

You are looking at two cells under a microscope. Both have the same shape, but cell A is smaller than cell B. Which of these statements correctly describes cell B?

		A.The larger cell has less surface area than the smaller cell.
		A.The larger cell has a smaller sur face-to- volume ratio than the smaller cell.
		A.The larger cell has the same surface-to-volume area as the smaller cell.
		A.The larger cell has more surface area than the smaller cell.

10 points

QUESTION 5

Which of these statements is true about ectotherms?

		A.Ectothermic animals tend to be found in arctic regions.
		A.E ctotherms tend to consume more calories than endotherms of similar size.
		A.Ectotherms tend to have more insulating structures than endotherms.
		A.Ectotherms use more energy for reproduction than for heat production.

amethystswan784

BIO120H1 Lecture Notes - Lecture 3: Sclerophyll, Outline Of Life Forms, Evaporation

BIO120H1 Full Course Notes

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