A mutualism in which the survival of one or both participants is dependent on the other is ____
Fill in the blank with the appropriate word.
obligate
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Which most accurately describes the expression "recombinant DNA"?
a. DNA molecule cloned from a given organism b. DNA molecule that contains genetic information from more than one organism c. DNA molecule that is moved from one tube to another in a laboratory d. DNA molecule isolated from a specific organism e. DNA molecule that has been used in a laboratory for experimental purposes
The vast majority of invertebrates are:
a. parasitic. b. protostomes. c. terrestrial. d. evolutionarily primitive. e. carnivores.
The coding regions of a gene are called
A) introns. B) exons. C) promoters. D) enhancers.
The first three children of a couple, both heterozygous for cystic fibrosis, were healthy; what is the probability that a fourth child will have the disease?
A) 100% B) 75% C) 50% D) 25% E) it is impossible to predict