Many species of birds form large flocks. What dispersion pattern describes this behavior?
A. random
B. uniform
C. rapid
D. social
E. clumped
E. clumped
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In which of the following divisions of Archaea would you be most likely to find organisms that flourish in hot, salty environments?
A. Cyanobacteria B. Euryarchaeota C. Thaumarchaeota D. Crenarchaeota
Which of the following is the most unique aspect of archaeon cell envelopes?
A. Some archaeons have lipid monolayers in their plasma membrane. B. Archaeon capsules can be composed of protein or polysaccharide. C. The cell walls contain a modified type of peptidoglycan D. The plasma membrane is composed of phospholipids
Anaphylaxis is the term for reactions caused when certain antigens combine with
A) IgE antibodies. B) macrophages. C) IgG antibodies. D) complement. E) histamine.
You are trying to improve growth in an economically important fish species. These fish have a gene that controls their size. There are two size alleles; L and S. You cross a large female (LL) with a small male (SS) and get all large fish! The genotypes of the F1 are 100% LS so you assume that large size is dominant to small. You then cross a small female (SS) with a large male (LL) and get all small fish! The genotypes of this F1 are all LS. How do you explain this result?
A. The gene for large size is a maternally inherited. B. L is dominant to S. C. The gene for large size is a sex-linked gene. D. L is not dominant to S. E. The gene for large size is a maternal effect gene and L is dominant to S.