Membrane-like structures form when proteins or
lipids are mixed with water. They serve as a model
for __________, which may have preceded cells. Fill in the blank(s) with the appropriate word(s).
Answer: protocells
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In seed plants, __________ allow reproduction without standing water. Fill in the blank(s) with the appropriate word(s)
The accompanying figure represents a sequence of events occurring in the neuronal membrane (designated by the numbers 1 and 2). The letter “I” indicates an ion. What event is mostly likely being portrayed in this figure?
a. activation of voltage-gated sodium channels
b. activation of voltage-gated potassium channels
c. activation of voltage-gated chloride channels
d. activation of sodium-chloride pumps
e. activation of sodium-potassium pumps
Which of the following occurs during interphase?
A) Chromatin becomes tightly coiled. B) Chromosome duplication occurs. C) Sister chromatids separate. D) The mitotic spindle forms.
Animals with pentaradial symmetry have 5 planes of symmetry.
Answer the following statement true (T) or false (F)