Which of the following could explain how 14 genes for globins, each specialized in their function (i.e., hemoglobin, myoglobin), arose in the genome?
A. misaligned crossover
B. gene deletion
C. gene mutation
D. misaligned crossover and gene mutation
E. misaligned crossover and gene deletion
D. misaligned crossover and gene mutation
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The cell wall of Gram-positive bacteria
A. contains a thin layer of peptidoglycan. B. contains a thick layer of peptidoglycan. C. is, due to its thickness, an excellent barrier to most molecules. D. contains an outer membrane containing LPS. E. contains a thin layer of peptidoglycan AND contains an outer membrane containing LPS.
Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a
A. neurogenic heart while vertebrates have a myogenic heart. B. myogenic heart while vertebrates have a neurogenic heart. C. neurogenic heart while vertebrates have a cardiogenic heart. D. cardiogenic heart while vertebrates have a myogenic heart. E. autonomous heart while vertebrates have a neurally controlled heart.
In the following alignment of 12 base pairs, which sites are phylogenetically informative? Sequence 1 ATTGGTATAAAA Sequence 2 ATTAGTATAAAA Sequence 3 ATTGGTATCAAA Sequence 4 ATTAGTATCAAA
What will be an ideal response?
Place these statements in their proper sequence.Walking through the botanical garden with a friend, you spy a rare and beautiful variety of Hosta. "Oh I would love to have one of those!" you exclaim. "But they cost a king's ransom." Your friend smiles, snips off a tiny piece of the shoot, and says, "I'll grow you one. I'll just take it back to lab and...1. use enzymes to break down the cell walls..."2. grow up a callus..."3. wait for somatic embryos to form..."4. culture an individual plantlet for you..."
Fill in the blank(s) with the appropriate word(s).