What is the minimum number of clones that should be in this mouse genomic library to have a 95% chance that it contains the entire genome?
The mouse genome consists of 2,700 Mb. A genomic library is constructed using BAC vectors and overlapping fragments of the mouse genome. The average size of the mouse DNA inserts is 200 kb.
A) 2,700
B) 13,500
C) 54,000
D) 135,000
C) 54,000
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Describe what it means to tare or zero an electronic balance. What purpose does this function serve?
What will be an ideal response?
During the first 5–600 million years on Earth, temperatures ranged from 500–1000°C, atmospheric pressure was 10 times current levels, and the planet was bombarded with meteorites. How would these conditions favor the formation of biological molecules?
A. Many chemical reactions are inhibited by high temperature and pressure. B. High temperature and pressure are the best conditions for enzyme function, needed to support life. C. Oxygen will break down many organic molecules by reduction. D. Oxygen in this high temperature and pressure atmosphere would have been chemically less reactive. E. Water and meteorite dust would have provided the chemical reactions necessary for formation of biological molecules.
Which is false regarding rotifers?
a. Most live in freshwater habitats. b. Males are unknown in some species. c. They share a common ancestor with annelids. d. They have a pseudocoelom. e. None of these are false.
Which of the following bacteria might be responsible for the formation of petechiae in a host?
A) Neisseria meningitidis B) Escherichia coli O157:H7 C) Klebsiella D) Proteus mirabilis