Which type of membrane transport is most important for nutrient acquisition in nutrient poor environments?
A. Simple diffusion
B. Active transport
C. Facilitated diffusion through membrane carrier proteins
D. Facilitated diffusion through channel proteins
Answer: B
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Thalidomide, an anticonvulsive and antihistamine medication, was shown to cause severely deformed limbs in children whose mothers took the medication. What might thalidomide do during development?
A. Cause a defect in the fertilization of an egg. B. Severely alter blastulation in the embryo. C. Impair morphogenetic fields within the embryo. D. Impair neural tube formation. E. Block cell division during blastulation.
If a cell was to stop dividing, in which part of
the cell cycle would it stop?
a. G1 b. S c. G2 d. telophase e. prophase
Which grouping includes all of the protists?
A) Domain Archaea B) Domain Eukarya C) Kingdom Animalia D) Kingdom Plantae
Stem cell transplants may someday be used to treat Parkinson's disease. Researchers are hopeful that these cells would alleviate the symptoms of Parkinson's disease by _____
A) preventing temporal lobe seizures B) repairing sites of traumatic brain injury C) replenishing missing ion channels D) secreting the neurotransmitter dopamine