The sporophyte stage of red algae produces spores that are shed into the water. What is the advantage of shedding spores into the water?
What will be an ideal response?
Releasing spores into the water allows them to be carried away by currents, thereby ensuring wide dispersal as a means of colonizing new areas and decreasing competition between new plants and their parents.
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Which processes can be carried out by consumers?
A. Only cellular respiration B. Only photosynthesis C. Both photosynthesis and cellular respiration D. Neither photosynthesis nor cellular respiration
Tumor suppressor genes function to
A) prevent gene expression of oncogenes. B) prevent release of growth factors. C) slow down unchecked cell growth, differentiation, division, or adhesion. D) produce proto-oncogenes. E) stimulate metastasis.
The Montreal Protocol:a
has not yet resulted in measurable decreases in the quantity of global warming chemicals. b. has not yet been ratified by the U.S. Senate. c. banned global use of CFCs by 1998. d. was signed by all 50 states.
e. limited production of CFCs.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.