What is the consequence of introducing charged amino acids into the hydrophobic core of an ER signal sequence?

#Question id: 9169

#Unit 9. Diversity of Life Forms

In areas of permafrost, stands of black spruce are frequently observed in the landscape, while other tree species are noticeably absent. Often these stands are referred to as "drunken forests" because many of the black spruce often "lean over" (that is, they are displaced from their normal vertical alignment). What is the most likely explanation for the unusual growth of these forests in this marginal habitat?

#Question id: 10975

#Unit 7. System Physiology – Animal

A teenaged boy with numerous nosebleeds was referred to a physician for evaluation prior to a minor surgery. His prothrombin time (PT) was 11 sec (11–15 sec normal), partial thromboplastin time (PTT) was 58 sec (25–40 sec normal), and bleeding time was 6.5 min (2–7 min normal). Which of the following is most likely abnormal in this young man?

#Question id: 5656

#Unit 5. Developmental Biology

What is the cortical reaction, and why is it important?

#Question id: 2979

#Unit 2. Cellular Organization

Use the data in the accompanying table to answer the question. Minutes Spent in Cell Cycle Phases-

#Question id: 16790

#Unit 13. Methods in Biology