How can two cells in the same complex multicellular organism have different fates?
A. Different genes are activated and
repressed in the two cells.
B. Different DNA sequences are found in the
nuclei of the two cells.
C. Different amounts of DNA are found in the
nuclei of the two cells.
D. Different types of transcription and
translation machinery are found in the two
cells.
E. All of these options are correct.
A
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Photosynthesis ceases when leaves wilt, mainly because _____
A) the chlorophyll in wilting leaves is degraded B) flaccid mesophyll cells are incapable of photosynthesis C) stomata close, preventing carbon dioxide from entering the leaf D) photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency E) accumulation of carbon dioxide in the leaf inhibits enzymes
Please match each category of disease with the correct example.
A. Seizure B. Tumor C. Movement D. Injury E. Mood F. Headache G. Neurodegenerative H. Demyelinating I. Infectious J. Sleep
Low-nutrient, oligotrophic waters will usually become stratified and have an anaerobic hypolimnion at certain times of the year.
Answer the following statement true (T) or false (F)
Fatal familial insomnia(FFI) is a very rare prion disease of the brain. FFI has no known cure and involves progressively worsening insomnia, which eventually leads to hallucinations, delirium, and dementia-like symptoms. The average age of diagnosis is about 40 years of age and the average life span after diagnosis is 18 months. FFI is not caused by an infection, but is inherited in an autosomal dominant fashion. Knowing its inheritance pattern AND knowing it is a prion disease, which of the following is accurate?
A. An individual who inherits one copy of the mutant allele will show the FFI phenotype. B. Individuals with FFI have inherited a gene that encodes a mutant form of a prion protein that folds abnormally. C. The abnormal prion protein gradually converts the normal prion proteins of the brain into abnormal prion proteins. D. The abnormal proteins do not get degraded and they form aggregates in brain cells. E. All of the answers are correct.