While wading in the ocean, you look down into the water and notice an umbrella-shaped, translucent animal. It swims by pulsing its body, and long tentacles trail behind it. One of them brushes your leg. Ouch! You feel a burning sensation where it touched
you. To what phylum does this creature probably belong?
A) Porifera
B) Cnidaria
C) Platyhelminthes
D) Mollusca
Answer: B
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If the allele frequency of a population of ducks
changes from one generation to the next, the population is undergoing
a. genetic equilibrium. b. upheaval. c. macroevolution. d. transition. e. microevolution
Mendel used testcrosses to determine whether he had truebreeding varieties of plants.
a. true b. false
Which one of the following is TRUE regarding erythropoietin?
A) It is secreted by the liver in response to rising blood pH. B) It causes the bladder to store increased amounts of urine. C) It is part of a positive feedback loop used to control the amount of hydrogen ion secreted by the kidneys. D) It stimulates the production of red blood cells in the bone marrow. E) It is secreted in response to rising blood oxygen levels.
Involuntary muscle includes ________
A) skeletal muscle only B) smooth muscle only C) smooth muscle and cardiac muscle D) smooth muscle, cardiac muscle, and some skeletal muscle