In some situations, the death rate of a population declines before the birth rate begins to decline. What can be concluded about the population?
A) The carrying capacity is being reached.
B) The population is in a demographic transition.
C) A density-dependent factor is in action.
D) The population occurs in an industrialized nation.
B
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Which of the following is NOT correct regarding the purple photosynthetic bacteria photosynthetic apparatus?
A. Possesses bacteriochlorophylls a or b B. Performs anoxygenic photosynthesis C. Has intracytoplasmic membranes (ICMs) to provide space for photosynthetic units (PSUs) D. Apparatus is continuous with the plasma membrane E. Apparatus is straight to decrease surface area and contain reactions
What is the relationship between operons and transcription units?
a. They are synonymous terms. b. An operon consists of a transcription unit plus associated regulatory DNA sequences. c. A transcription unit consists of an operon plus associated regulatory DNA sequences. d. An operon is composed of multiple transcription units. e. A transcription unit is composed of multiple operons.
Organisms that live under similar environmental conditions and location, and interact directly or indirectly are part of the same:
a. ecosystem. b. biosystem. c. abiotic habitat. d. biotic habitat. e. population.
Which of the following results in a stable population?
a. higher birth than death rates b. equal birth and death rates c. lower birth than death rates d. no births while death remains constant