Porins are channels in the outer membranes of gram-positive Bacteria
Indicate whether the statement is true or false.
Answer: FALSE
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What can be assumed from these results?
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. A. The newly synthesized compound induces a mutation in the bacteria. B. The bacteria no longer produce histidine. C. The bacteria produce histidine. D. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine. E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
What percentage of Earth's productive land is currently used by the human population for crops and livestock?
A) 20% B) 75% C) 40% D) 55% E) 90%
The sequencing method that cuts the DNA of an entire chromosome into small fragments and then clones these fragments is called
A. RFLP sequencing. B. clone-by-clone sequencing. C. consensus sequencing. D. shotgun sequencing.
Which statement about locomotion is true?
A) Locomotion requires energy to overcome friction and gravity. B) Gravity is a greater locomotion problem for animals in water than for those on land. C) Overcoming friction is a greater locomotion problem for land animals than for those that live in water. D) Bone strength is more important than body shape in the locomotion of land animals.