The buildup of soil on bare rock by the decomposition of early colonizers is characteristic of ________ succession
A) primary
B) ecological
C) opportunistic
D) secondary
A
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The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated. b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. it confirmed that each cell of a given species contains the same amount of DNA. d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. it demonstrated that mice can change the hereditary content of bacteria.
Which of the following is a characteristic of most annelids?
a. Chitinous hairs b. Paired, unjointed limbs c. Temporary gonads d. Scraping structures
From the equator to latitudes 10° north and south, high rainfall, high humidity, and mild temperatures can support
____________________. Fill in the blank(s) with the appropriate word(s).
Women with X-linked disorder always pass the genes for the disorder to ________________, while men with X-linked disorder always pass the genes for the disorder to___________ .
A. only their daughters; only their daughters B. both their daughters and sons; only their sons C. both their daughters and sons; only their daughters D. both their daughters and sons; their daughters and sons