All of the following have exoskeletons EXCEPT
a. lobsters.
b. spiders.
c. insects.
d. earthworms.
e. centipedes.
Answer: d
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Osmoregulation is best defined as:
A. the control of osmotic pressure through regulation of water and solute levels. B. the movement of water from areas of lower solute concentration to areas of higher solute concentration. C. the difference in solute concentration on the two sides of a membrane. D. the movement of water through aquaporins. E. the regulation of membrane permeability.
The first antibody secreted upon exposure to an antigen.
What will be an ideal response?
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?
A) These genes would be maintained in case the antibiotics appear. B) These bacteria would be outcompeted and replaced by bacteria that have lost these genes. C) These bacteria would try to make the cost worthwhile by locating and migrating to microenvironments where traces of antibiotics are present. D) The number of genes conveying antibiotic resistance would increase in these bacteria.
The photosynthetic membranes of the green sulfur bacteria are called ________.
A. chloroplasts B. chlorocytes C. chlorosomes D. chlorophylls