Which fossil fuels provides the raw materials to produce a variety of plastic goods?
A. Coal
B. Natural gas
C. Biomass
D. Gasoline
E. Oil (petroleum)
Ans: E. Oil (petroleum)
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Tadpoles must undergo a major metamorphosis to become frogs
This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by thyroxine. What is the most likely explanation for such a wide array of effects of thyroxine? A) There are many different forms of thyroxine, each specific to a different tissue. B) Different tissues have thyroxine receptors that activate different signal transduction pathways. C) Some tissues have membrane receptors for thyroxine, while other tissues have thyroxine receptors within the nucleus. D) Different releasing hormones release thyroxine to different tissues.
Which of these best represents natural selection?
A) Recessive albinism is more common among the Hopi of Arizona than in the general population of the U.S. B) A gradual change in specific human mitochondrial DNA sequences occurs along the Nile river in Egypt. C) ABO blood type frequencies are similar in northern Africa, southern Spain, and the middle east. D) Lactose tolerant alleles are very prevalent in herding populations that drink milk as a staple.
Sister chromatid exchanges increase in frequency in the presence of X rays, certain viruses, ultraviolet light, and certain chemical mutagens. In what autosomal recessive disorder is there known to be an increase in sister chromatid exchanges?
What will be an ideal response?
The cap and tail are not part of the message used to construct a polypeptide. If false, make it a correct statement.
a. true b. false