In lettuce seeds, blue light initiates germination. If you measured hormone levels within the seed, which hormone would be produced upon exposure to blue light?
A) gibberellin
B) ethylene
C) abscisic acid
D) cytokinins
A
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Which of the following statements provides evidence that organelles (e.g., mitochondria and chloroplasts) originated billions of years ago as a result of primitive eukaryotic cells engulfing free-living bacterial cells? (Choose all that apply)
A. Their DNA is usually circular. B. They have an inordinate amount of noncoding DNA. C. They do not synthesize proteins. D. Their DNA is packed as a nucleoid rather than as a chromosome.
The assignment of names to taxonomic groups is referred to as ________.
A. identification B. systematics C. taxonomy D. nomenclature
Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste
What is the most logical explanation? A) Student A had an allergic reaction to the food, causing him to perceive the food as being bitter. B) Student A has normal "bitter" taste buds; student B has defective "bitter" taste buds that result in lower sensitivity to bitterness. C) Student A has a protein receptor capable of detecting a bitter molecule found in that substance, whereas student B lacks that particular protein receptor. D) Student A has normal saliva, whereas student B's saliva is more alkaline than normal.
After following populations of E. coli for 1150 generations, Sandra Trindale and her colleagues noted that most mutations are _______
Fill in the blank with the appropriate word.