Which of the following is not a characteristic of bacteria?
A. Organelles termed mitochondria are the site of ATP production.
B. The cell wall is made of peptidoglycan or other distinct polysaccharides.
C. Ribosomes are present as the site of protein synthesis.
D. DNA is free in the cytoplasm.
Answer: A
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The color of petunia flower can be changed from red to blue by altering the pH of the soil. This is an example of
A. norm of reaction. B. the environment influencing the genotype. C. codominance. D. incomplete dominance. E. range of inheritance.
What molecule is NOT involved in appetite regulation?
A. leptin B. insulin C. ghrelin D. alpha-melanocyte-stimulating hormone E. secretin F. neuropeptide Y
Red imported fire ants are an invasive species in United States. How have they harmed the Texas horned lizard, which feeds on native ants?
a. They act as parasites on the lizards. b. They are poisonous to the lizards. c. They damage the lizard's breeding area. d. They increase the amount of predatory birds, which eat lizards. e. They have replaced many native ant populations, so the lizards have less food.
. Which of the following are characterized by
radially symmetrical members?
a. annelids b. arthropods c. cnidarians d. roundworms e. flatworms