The "pin" structure of a helicase:
A. serves as a spool for the DNA.
B. holds the helicase dimers in the correct position.
C. allows rewinding of the DNA after transcription.
D. separates the complementary strands of DNA.
E. prevents a translocation mechanism.
D
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How is the Ti plasmid used to create transgenic plants?
a. The Ti plasmid allows all of the plant cells to host the bacteria Rhizobium radiobacter and thus express the foreign gene that was inserted into the bacterial chromosome. b. The Ti plasmid inserts the foreign gene directly into the plant's nuclear DNA. c. Once the Rhizobium radiobacter forms a tumor in the plant, the tumor cells can take up the foreign DNA and incorporate it into their chromosomes. d. The Ti plasmid inserts the foreign DNA into the DNA in the chloroplast. e. The Ti plasmid inserts the foreign DNA into the plant's mitochondrial DNA.
Identify the only correct statement regarding the heritability of a trait
1.Heritability of a particular trait can be calculated only in individuals, not in populations. 2.Heritability defines the genetic contribution to a trait in a population of relatives. 3.In heritability studies, the correlation coefficient is a measure of the total number of relatives affected by the trait. 4.Heritable traits are not affected by the environment.
A regular strength training program reduces resting metabolic rate.
a. true b. false
An agent of acute communicable conjunctivitis (pinkeye) is
A. Haemophilus influenzae. B. Haemophilus ducreyi. C. Haemophilus aegyptius. D. Haemophilus parainfluenzae. E. Haemophilus aphrophilus