All of the following are characteristics of IgM, except
A. it is a dimer.
B. it contains a central J chain.
C. it is the first class synthesized by a plasma cell.
D. it can fix complement.
E. it has 10 antigen binding sites.
Answer: A
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If cowbird eggs are laid in an oropendola nest that is located near bee hives, what would be the expected outcome?
a. The cowbird eggs would be ejected from the nest to eliminate the competition. b. The cowbird eggs would be ejected from the nest due to a reaction of the mother bird's immune system. c. The cowbird eggs would not be ejected from the nest because they provide an additional food source. d. The cowbird eggs would not be ejected from the nest because they provide protection from large predators. e. The cowbird eggs would not be ejected from the nest because they provide protection from parasites.
How are acrosomal proteins released?
a. The most soluble acrosomal proteins are released first; bound acrosomal proteins are released second d. Acrosomal proteins are released after the zona pellucida is penetrated b. Bound acrosomal proteins are released first; soluble acrosomal proteins are released second e. Sperm begin the acrosomal reaction after reaction with the zona pellucida c. Acrosomal proteins are released in one phase
What organisms convert gaseous nitrogen into ammonium or nitrates that can be used by plants?
a. tertiary consumers b. nitrogen-fixing bacteria c. fish d. legumes e. corn and other grains
What leads to an individual having too many or two few chromosomes?
A) Crossing over B) Independent assortment C) Homologous recombination D) Nondisjunction