Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth, which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures.
B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base.
C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay.
D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans.
E. Mix some amino acids in salt water and cool down to 0C.
C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay.
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Explain why organisms undergoing rapid evolutionary change often contain relatively large numbers of mobile DNA elements, whereas once organisms settle into a stable evolutionary niche, most of these mobile elements are lost
What will be an ideal response?
Which of the major plant evolutionary adaptations to land would be represented by this plant species?
1.no water required for fertilization
2.development of vascular tissue
3.naked seeds
4.nourished seeds and flowers
Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment. B) interactions among species have no significant influence on community structure. C) when one species is removed, the populations of the other species are unaffected. D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
Which of the following examples does NOT illustrate the interrelationship of form and function?
A. Heart valves are designed and placed within the heart so that they are opened and closed by changing pressures in the chambers in the heart during one cardiac cycle (the events that occur during the time from one heartbeat to the next). B. In a negative feedback system, the product of the response "feeds back" to depress or eliminate the original stimulus. C. The second cervical vertebra (second bone of the spine) has a small process on it that acts as a pivot point so that the first cervical vertebra (top bone in the spinal column) can rotate to the left and right to allow you to shake your head "no." D. Door hinges have a pin around which the door rotates when it is opened and closed.