Stromatolites appeared about ____ years ago.
Answer: 3,500,000,000
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Enzyme 1 converts substrate A into product B. Is this an example of a metabolic pathway?
A. Yes. This is a metabolic pathway that includes feedback inhibition. B. No. This only describes one chemical reaction. A metabolic pathway includes multiple chemical reactions. C. Yes. This is a simple metabolic pathway. D. No. A metabolic pathway must include an inhibitory step.
Tetracycline and chloramphenicol are the drugs of choice for the treatment of many of the rickettsial diseases
Indicate whether the statement is true or false.
____ is a synthetic auxin that stimulates root development on stem cuttings and is used extensively in asexual
propagation. a. Indoleacetic acid b. Indolebutyric acid c. Naphthalene acetic acid d. 2,4-D e. 2,4,5-T
A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a trait determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. Only ten remain, and those birds all have yellow feathers. Which of the following statements is true?
A) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds. B) The hurricane has caused a population bottleneck and a loss of genetic diversity. C) This situation illustrates the principle of adaptive radiation. D) This situation illustrates the effect of a mutation event. E) The ten remaining birds will mate only with each other, and this will contribute to gene flow in the population.