Define the Oparin-Haldane hypothesis and explain how it has been tested in a laboratory
What will be an ideal response?
The Oparin-Haldane hypothesis proposes that conditions on early Earth allowed the formation of
organic compounds that were essential building blocks in the first cells. In a closed vessel, hydrogen,
methane, ammonia, and water vapor were exposed to charged electrodes. Over the course of a week,
urea, amino acids, lactic acid, formic acid, and acetic acids had all formed in the container. If the
original atmosphere had the same composition as what was in the container, this experiment showed
one way in which organic molecules could have formed.
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Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red spot on the parent's bill, which causes the parents to open the bill and regurgitate their food
Chicks will peck at a red dot painted on any long, slender object. For the chicks, pecking is a ____ and the red dot is a ____ . For the adult gulls, the chicks pecking at their bills is a ____ and regurgitating food is a ____ . Fill in the blank with the appropriate word.
The entire DNA sequence of a species is called its ________________.
Fill in the blank(s) with the appropriate word(s).
How do plant and animal viruses differ in their mode of entry into host cells?
What will be an ideal response?
The ____, which is made of transparent crystallin protein, covers the front of the eyeball
a. lens b. sclera c. cornea d. iris e. retina