Answer the following statements true (T) or false (F)
1. Scientists developing drought tolerant plants can use the knowledge of relative water content as models for predicting how these plants will respond to stress.
2. If scientists want to develop plants that can withstand cold conditions they would breed for the ability of the plant to increase solutes in cells.
3. One possible explanation for the reason water can be transported up the vessels in plants is because of adhesion of water to the lignified walls.
4. Given the same driving force, water transport in vessels is more rapid than that in tracheids because of the end wall perforation of vessels.
5. Liquids move faster in plant cells by bulk flow than by diffusion.
1. TRUE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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Which statement about endotoxins is true?
A.) Endotoxins are released only when bacteria die and their cell walls break down. B.) An example of a prokaryote that produces endotoxins is Clostridium botulinum. C.) Endotoxins are components of the cell wall of gram-positive bacteria. D.) The source of endotoxins is endospores. E.) Endotoxins are proteins secreted by prokaryotes.
In pea plants, smooth seeds (S) are dominant over wrinkled seeds (S). A cross is made between a wrinkled-seed variety and a heterozygous smooth-seed variety. The chance of getting offspring homozygous for smooth seeds is
A. 0/4. B. 1/4. C. 1/2. D. 1/1.
Legionnaires disease emerged in 1976 due to
A. a mutation of the influenza virus. B. contamination of an air-conditioning system. C. the abuse of antibiotics. D. the consumption of horseshoe bats. E. exposure to wild monkeys.
Which scientist showed that anthrax was caused by the bacterium Bacillus anthracis?
A. Antonie van Leeuwenhoek B. Joseph Lister C. Louis Pasteur D. Ignaz Semmelweis E. Robert Koch