The minimum age of the LUCA (last unique common ancestor) is the age of the oldest fossils that can be identified with certainty as close relatives of present-day prokaryotes and eukaryotes. Such fossils are about ________
A) 3.8 billion years old
B) 2 billion years old
C) 542 million years old
D) 3.28 billion years old
E) 65 million years old
B
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A genetic cross was performed with two pea plants having green, wrinkled seeds. Of the resulting offspring, 75% had green, wrinkled seeds and 25% had green, smooth seeds. With regard to wrinkled versus smooth seeds, the parents must have been ________.
Fill in the blank(s) with the appropriate word(s).
Most codons specify a(n) _____
a. protein b. polypeptide c. amino acid d. mRNA
Deficiencies of brush border enzymes in the small intestine would NOT affect the complete digestion of __________.
A. fats B. starch C. DNA and RNA D. sucrose E. proteins Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about enzymes found on the brush border? 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?
Typical eukaryotic genomes are composed of ________ chromosomes
A) multiple linear B) multiple circular C) a single circular D) a single linear E) both linear and circular