What are the three things DNA must be able to do in order to serve as the genetic material?
What will be an ideal response?
In order to serve as the genetic material, DNA must be able to replicate, it must be able to store information, and it must be able to change through mutation.
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Consider the structure of a trophic pyramid when answering the following questions: Why are shrimp more abundant than whales in the ocean?
A. Whales reproduce more slowly, so maintain small population sizes. B. More energy is available to primary consumers, and thus the biomass/abundance of primary consumers is greater than that of secondary consumers. C. Whales are warm-blooded secondary consumers and lose more energy as heat, therefore their level on a trophic pyramid is smaller (more narrow) than for shrimp (primary consumers). D. The levels of the trophic pyramid represent the percentage of primary producers that make up a consumer's diet. Whales eat less of the primary producers, so their level on a trophic pyramid is smaller than the level for shrimp.
A key influence of the atrioventricular node on the heartbeat is to
A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles. E. block backflow of blood from the aorta into the right ventricle.
Which mechanism(s) of obtaining energy and nutrients are only present in bacteria and archaea, but not eukaryotes?
a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. chemoautotrophs and photoheterotrophs
The mosses, liverworts, and hornworts are
members of which group?
a. conifers b. ferns c. gymnosperms d. bryophytes e. angiosperms