In an average person, ____ erythrocytes are produced each second
a. 200 to 300
b. 2,000 to 3,000
c. 2 to 3 million
d. 4.8 to 5.4 million
e. 2 to 3 billion
ANSWER: c
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Why does conjugation with an Hfr donor result in a much higher rate of gene transfer than conjugation with an F+ donor?
A) An F+ donor makes fewer pili. B) An F+ donor's T strand is slow to reach the pilus. C) The Hfr donor transfers genes from the chromosome and not the plasmid. D) The Hfr donor segment must undergo recombination in the recipient. E) The F+ donor segment must undergo recombination in the recipient.
To enhance the efficiency of transformation, bacterial cells can be induced to take up DNA by a strong electrical field
Indicate whether the statement is true or false
You take a sample of bacteria with DNA that contains only 14N and allow them to replicate in a medium that contains only 15N. After 3 rounds of replication, what percent of the DNA molecules will contain one strand with only 14N and one strand with only 15N? Enter your answer as a whole number without the percent sign. For example, 5% would be entered as 5 and 37% would be entered as 37.
Fill in the blank(s) with the appropriate word(s).
A mutation that changes a normal codon to a stop codon is called a
A. back mutation. B. point mutation. C. silent mutation. D. missense mutation. E. nonsense mutation.