Tutor profile: Katherine G.
While abroad, you find yourself in need of directions back to your hotel. In Spanish, how could you ask a local for directions?
I would begin with a casual greeting explaining that I was lost and needed assistance locating the direction of the hotel. For example, “Hola! Estoy perdido. Me podria ayudar con direcciones para el hotel Rosa? Se lo agradeceria mucho.”
Protein kinases are enzymes that add phosphate groups to other enzymes. What happens to these other enzymes upon phosphorylation?
When an enzyme is phosphorylated, its activity is changed. Some enzymes become more active, such as phosphorylase kinase, while others become less active. Regardless, this form of covalent modification is essential for many biological processes to be functionally carried out in the cellular environment.
If a woman expresses an X-linked recessive trait, what definitive conclusions can be made about her parents?
The woman’s sex chromosomes, XX, inform us that both alleles must be carrying the recessive trait since it is being expressed. Recessive traits require both chromosomes to express the same faulty allele. Since one allele comes from the mother and the other from the father, one can conclude that each parent has at least one copy of the recessive allele. Additionally, this information tells us that the woman’s father expresses the same trait as her since his sex chromosomes, XY, indicate that his only X chromosome carries the recessive trait. However, the mother only passed on an allele for the trait and does not express the same trait due to dominance of normal gene in contrast to the recessive allele.
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