Which process does not occur in ecosystems?
A) Energy flows through the system.
B) Carbon is cycled between biotic and abiotic forms.
C) Producers convert light energy to chemical energy.
D) Consumers directly use the energy source that powers the system.
Answer: D
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When cells differentiate they
a. lose DNA b. remain totipotent c. express a specific subset of genes d. stop growing e. gain DNA
Polar molecules
A. have an unequal charge distribution. B. always involve oxygen. C. are insoluble in water. D. have an equal charge distribution. E. always contain carbon.
A chromosome ____
a. consists of DNA and its associated proteins b. is a single stranded DNA molecule c. anchors the DNA within the nucleus d. stabilizes the nuclear membrane e. is found within the nucleus and cytoplasm
Parental care of the young is usually associated with species with a type ________ survivorship curve.
A. I B. II C. III D. I or II (depending on the sex ratio) E. I or III (depending on whether the reproductive strategy is iteroparous or semelparous)