Four of the five answers listed below are density-independent factors. Select the exception
a. nutrient supply
b. temperature drop
c. drought
d. volcanic eruption
e. hard freeze
A
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Bacteria within biofilms exchange
A. plasmids. B. nutrients. C. quorum-sensing molecules. D. All of the choices are correct.
A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. a prophage switched from the lysogenic cycle to the lytic cyle B. a prophage switched from the lytic cycle to the lysogenic cycle C. the bacteria are infected with a temperate phage D. the bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle E. the bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle
During prophase II,
a. a new bipolar spindle forms. b. crossing over occurs. c. chromosomes are single-stranded. d. the cell is diploid. e. the nuclear envelope re-forms.
Human brains today are about three times the size of the brains of the earliest hominids
a. true b. false