Which of the following could be a valid scientific hypothesis?
A) Moray eels find their prey primarily by following chemical cues.
B) All marine animals must have gills.
C) It is immoral to keep dolphins in captivity.
D) Dogs are superior in intelligence and swimming capabilities compared to seals.
A) Moray eels find their prey primarily by following chemical cues.
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You are in a lab studying a new cell type that has been discovered. You observe a rigid cytoskeleton in this cell, along with a nucleus and a compartmentalized interior. How would you classify this cell?
A. as an advanced prokaryotic cell, because it has a rigid cytoskeleton B. as a primitive prokaryotic cell C. as a possible transitional cell from prokaryotic to eukaryotic D. as a eukaryotic cell that has to be heterotrophic E. None of the answers options is correct.
Answer the following statements true (T) or false (F)
1. Photons from light can boost an electron to a higher energy state. 2. Harnessing light and splitting water occurs in both photosystem I and II. 3. The Calvin cycle is only capable of fixing carbon dioxide in the dark. 4. In hot and arid environments, plants that maximize photorespiration produce the most sugars.
The rectal gland of sharks is involved in the excretion of:
a. urea. b. sodium chloride. c. calcium and magnesium. d. trimethyamine oxide. e. carbon dioxide.
Human female germ cells form
a. before birth. b. shortly after birth. c. at puberty. d. during late teenage-hood. e. at fertilization