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Tutor profile: Chris B.

Inactive
Chris B.
Biology and Spanish Major Pre-Med Student
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Questions

Subject: Spanish

TutorMe
Question:

Indica si se requiere "lo" en la frase siguiente y ¿por qué? A Pablo ___ mato yo.

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Chris B.
Answer:

Esp: Si se requiere el "lo." En español, la única vez que no duplicar el objeto es cuando hay un objeto directo, pos-verbal que es un sustantivo. Pablo es un sustantivo y objeto directo, pero pre-verbal. Por eso, es necesario duplicarlo con el uso de "lo." Eng: Yes the "lo" is required. In Spanish, the only time that the object is not duplicated is when there is a post-verbal direct object that is a noun. Pablo is a noun and direct object, but pre-verbal. For this reason, it is necessary to duplicate the object by using "lo."

Subject: MCAT

TutorMe
Question:

What information about a molecule would be most helpful in determining what type membrane transport allows for its translocation across the cell membrane.

Inactive
Chris B.
Answer:

The two most helpful pieces of information would be the size and polarity of the molecule. Because the membrane is nonpolar and hydrophobic, large polar molecules (which are hydrophilic), cannot undergo simple diffusion across the membrane. If a transport protein or channel can allow the molecule to undergo facilitated diffusion across the membrane and thus does not require energy. Other enzymes combined with an energy cost could allow the molecule to undergo active transport across the membrane.

Subject: Biology

TutorMe
Question:

Describe frequency dependent selection in detail.

Inactive
Chris B.
Answer:

Frequency dependent selection is the phenomenon between one or more phenotypes whereby the fitness level of a particular phenotype decreases as the frequency of that phenotype within the population increases.

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