Humans suffer from dementia (similar to Alzheimer's disease) if they eat flour made from cycad seeds because:
A. The seeds have high levels of manganese that is a cause of dementia.
B. The seeds contain hallucinogenic drugs similar to LSD that causes dementia.
C. The seeds have enzymes that break down brain tissue causing dementia.
D. The seeds contain the amino acid BMAA that causes dementia.
E. The seeds have enzymes that inhibit absorption of nutrients that are essential for the transmission of nervous impulses in brain cells.
D. The seeds contain the amino acid BMAA that causes dementia.
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If a new species with root-like structures is discovered, how could you tell if it is a plant or a
fungus?
a. Compare the composition of the cell walls. b. Look for green coloration. c. Look for the presence of chloroplasts. d. All of these would be useful
Apoptosis can be described as
A) programmed cell death. B) gastrulation. C) phagocytosis. D) neural tube formation.
A scientist wants to determine whether a mutant phenotype is due to the loss of gene C or gene D, which are both deleted in a mutant fly with abnormal eyes. Mutant flies with transgenic gene C have wild-type eyes, whereas mutant flies with transgenic gene D have abnormal eyes. What can be concluded from these results?
A) Either gene C or gene D is required for normal eye development. B) Both gene C and gene D are required for normal eye development. C) Gene C is required for normal eye development. D) Gene D is required for normal eye development.
The brains of patients with Alzheimer’s disease have a reduced level of
1.serotonin. 2.dopamine. 3.acetylcholine. 4.aspartic acid. 5.GABA.