Current theories hold that hominin species migrated out of Africa
A) once, 10 million years ago.
B) once, nearly 800,000 years ago.
C) once, about 150,000 years ago.
D) once, nearly 2 million years ago.
E) multiple times throughout history.
E
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You go to the movies with a friend, and he refuses to share your popcorn. He says that he heard that movie theatre popcorn is triploid. What is the most likely explanation for this?
A. Most corn is genetically modified by large agricultural companies. B. The buttery topping on movie theatre popcorn causes chromosomal abnormalities. C. Popcorn is made from a different species of maize than regular corn. D. All popcorn is triploid, because the starchy part of the kernel is triploid endosperm tissue. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about seed structure? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In eukaryotes, the 3? end of the mRNA is important in the initiation of translation because
A) it contains Kozak sequences that aid in initiation. B) translation occurs in the 3? to 5? direction. C) eIF4A is attached to the 3? end and removes any secondary structure that might prevent translation. D) the 3? poly(A) tail and PABP bind initiation factor eIF4G, stabilizing the 5? end of the mRNA. E) it contains Kozak sequences that aid in initiation of translation in the 3? to 5? direction.
The primary component of the plasma membrane is:
A) carbohydrate. B) cholesterol. C) phospholipid. D) protein.
In the process of ________, ATP is synthesized when excited electrons from chlorophyll P700 pass through a series of electron carriers then return to chlorophyll P700.
A. acyclic photophosphorylation B. photosynthesis C. cyclic photophosphorylation D. noncyclic photophosphorylation