The form of DNA that contains genes that are actively being transcribed is called _______
(a) histones
(b) telomeres
(c) heterochromatin
(d) euchromatin
Ans: (d) euchromatin
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Burning a log is an example of a combustion reaction. This type of reaction is a reverse reaction of photosynthesis. Based on this information, what products would be formed from burning a log?
A. carbon dioxide and water B. oxygen and carbon dioxide C. oxygen and water D. glucose and oxygen E. carbon dioxide and glucose
Rosalind Franklin used which technique to
determine many of the physical characteristics of DNA? a. transformation b. transmission electron microscopy c. density-gradient centrifugation d. X-ray diffraction e. all of these
Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
A. Natural selection cannot account for losses, only for innovations. B. Natural selection accounts for these losses by the principle of use and disuse. C. The ancestors of these organisms experienced harmful mutations that forced them to find new habitats that these species had not previously used. D. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
Compare and contrast Type I and Type III survivorship curves. Sketch a correctly labeled graph to support your
comparison. BONUS: Identify two organisms that represent each of the two types of survivorship strategies discussed here. What will be an ideal response?