In a population of organisms, random mutations are retained or eliminated through the process of ____
What's the answer for this statement?
Answer: selection
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The base analog 5-bromouracil can tautomerize. One tautomer behaves like thymine and the other behaves like cytosine. If 5-bromouracil is used as a mutagen, what is the minimum number of times replication must occur to mutate the codon for proline (CCC) into the codon for serine (TCC)?
A) one generation B) two generations C) three generations D) 5-bromouracil cannot induce this mutation
Fungi are classified into phyla based on the
A. number of cells, multicellular or unicellular. B. composition of the cell wall. C. ability to undergo photosynthesis. D. organelles. E. sexual structures.
In humans, one pair of pharyngeal pouches become the tube-shaped organ called the
A. trachea. B. esophagus. C. pharynx. D. bronchial tube. E. Eustachian tube.
Why is the pancreas both an endocrine and an exocrine gland?
A. It secretes insulin through the pancreatic duct and secretin into the blood. B. It secretes bile through the pancreatic duct and insulin into the blood. C. It secretes insulin through the pancreatic duct and bile into the blood. D. It secretes pancreatic juice through the pancreatic duct and insulin into the blood. E. It secretes secretin through the pancreatic duct and insulin into the blood.