Gene therapy ____
a. has not yet been used successfully with mammals
b. is a surgical technique that replaces defective genes with normal genes
c. has been used successfully to treat victims of autosomal dominant disorders by replacing the dominant allele
with a recessive allele
d. is a genetic engineering technique that replaces defective alleles with normal ones
e. is only possible in adults
ANSWER: d
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The F (fertility) plasmid contains a set of genes that encode for the ________ proteins that are essential in conjugative transfer of DNA
A) pili B) SOS repair C) transduction D) transformation
A human cell has
A) 22 pairs of sex chromosomes and one pair of autosomes. B) 22 pairs of autosomes and one pair of sex chromosomes. C) 23 pairs of autosomes. D) 23 pairs of autosomes and a pair of Y chromosomes.
In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A. Their offspring are progressively weaker than the parents. B. They are more prone to disease than are horses and donkeys. C. They do not live as long as horses and donkeys. D. They are sterile.
Which of the following represents the correct air pathway during exhalation?
A) Bronchioles, bronchi, alveoli, trachea, larynx B) Trachea, larynx, bronchi, alveoli, bronchioles C) Larynx, trachea, bronchi, bronchioles, alveoli D) Alveoli, bronchioles, bronchi, larynx, trachea