Antigens are substances that the immune system does not recognize as self. Which of the following are antigens?
A) HIV B) cancer cells in the lung
C) strep throat bacteria D) All of these can act as antigens.
Answer: D
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Which would be TRUE of comparing the DNA fingerprints from hair samples of identical twins?
A. Some bands match. B. No bands match. C. Every band matches. D. Exactly 50% of the bands match. E. Most bands match.
Explain the concept of combinatorial gene regulation in eukaryotes
What will be an ideal response?
Crows feeding on whelks drop the whelks from the air until their shell breaks, allowing the crows to eat the mussel inside. What factor(s) is/are important for crows optimizing this foraging strategy?
A. the force of gravity in each drop and the height per drop B. the force of gravity in each drop C. the number of drops needed to break the shell D. the height per drop E. the number of drops needed to break the shell and the height per drop
The H zone never includes ______.
A. myosin B. actin C. titin D. the M band