The tendency of molecules to stick together, called cohesion, is stronger in water than other liquids because the polarity of water allows a(n):
A) hydrogen atom from one water molecule to form an ionic bond with the oxygen atom of another water molecule.
B) hydrogen atom from one water molecule to form a hydrogen bond with the hydrogen atom of another water molecule.
C) hydrogen atom from one water molecule to form a covalent bond with the oxygen atom of another water molecule.
D) oxygen atom from one water molecule to form a hydrogen bond with the oxygen atom of another water molecule.
E) hydrogen atom from one water molecule to form a hydrogen bond with the oxygen atom of another water molecule.
E) hydrogen atom from one water molecule to form a hydrogen bond with the oxygen atom of another water molecule.
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Which of the following statements does NOT correctly describe differences between larval and adult tunicates?
A. Larval tunicates have a conspicuous notochord that is lost by the time they become adults. B. Larval tunicates have a hollow dorsal nerve cord that is reduced to only a ganglion in the adult. C. The tail of the larval tunicate is lost by the time it transforms into an adult. D. The pharynx of the larval tunicate becomes more prominent in the adult. E. The larval tunicate lacks an incurrent and excurrent siphon but the adult has both structures.
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. Individuals with FFI have inherited a gene that encodes a mutant form of a prion protein that folds abnormally. B. The abnormal prion protein gradually converts the normal prion proteins of the brain into abnormal prion proteins. C. The abnormal proteins do not get degraded and they form aggregates in brain cells. D. An individual who inherits one copy of the mutant allele will show the FFI phenotype. E. All of these are correct.
A pH of 4 is __________ times more __________ than a pH of 7
a. 3; basic b. 3; acidic c. 1000; neutral d. 1000; basic e. 1000; acidic
Kevin is studying predator-prey interactions. One day he notices a spider eating a cricket caught in its web. Later that day, a bird eats the spider. How many consumers are there is this scenario?4
What will be an ideal response?