Describe the difference between the use of streptokinase and coagulase as a defense mechanism among pathogens
What will be an ideal response?
Answer: Pathogens like Streptococcus pyogens use streptokinase as a fibrinolytic enzyme that dissolves fibrin clots, which makes invasion of pathogens impossible by localizing their infection. On the other hand, coagulase is used by pathogens like Staphylococcus aureus to form and insoluble fibrin layer around them, thus protecting themselves from attack from host cells.
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A woman with blood type B and a man with blood type A could have children with which of the following phenotypes?
A. AB or O B. A, B, or O C. A, B, AB, or O D. AB only
Carbon-14 dating is best used for determining ages of ________
a. metamorphic rock samples 2 to 3 billion years old b. carbon-containing samples less than 100 years old c. igneous rock samples 3 to 4 billion years old d. carbon-containing samples less than 60,000 years old
Which is the most important role of the G2 checkpoint?
a. Determining whether conditions are favorable for cell division to proceed b. Checking for damage to genomic DNA c. Determining if all the sister chromatids are correctly attached to the spindle microtubules d. Ensuring that all the chromosomes have been replicated and that replicated DNA is not damaged
Which of the following processes moves large molecules across a membrane in the opposite direction of the others?
A. endocytosis B. exocytosis C. receptor-mediated endocytosis D. phagocytosis E. pinocytosis