Which of the following is an example of mutualism?
a) a clown fish lives inside a sea anemone and is protected by it, while the anemone receives nothing from the clown fish
b) a jaguar kills and consumes a gazelle
c) a remora fish removes algae and parasites from a shark's skin and receives protection in return
d) a wasp paralyzes a caterpillar and lays its egg inside it
e) a female cuckoo lays its egg in the nest of a smaller bird, which then raises the cuckoo chick
Answer: c) a remora fish removes algae and parasites from a shark's skin and receives protection in return
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A) a decrease in the volume of the thoracic cavity B) a decrease in the residual volume of the lungs C) the contraction of the diaphragm D) the closure of the epiglottis E) the expansion of the rib cage
Double fertilization is
A. fertilization of two eggs in the same flower.B. fertilization of an egg by two sperm. C. fertilization of an egg by one sperm and an endosperm-forming cell by another sperm. D. fertilization of two eggs by the same sperm. E. fertilization of an egg and an endosperm-forming cell by the same sperm.
The potassium channel differs from the sodium channel in that only the sodium channel
a. uses energy to force ions from the cell. b. uses energy to force ions into the cell. c. does not use energy, whereas the potassium channel does. d. is typically open, and does not block ion movement. e. is typically closed, blocking ion movement.
Viral infections can usually be treated with antibiotics
Indicate whether the statement is true or false