In an experiment, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several hours per day. The flexibility of these plants was due to the ________ cells.
A. parenchyma
B. sclerenchyma
C. periderm
D. aerenchyma
E. collenchyma
Answer: E
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The pulmonary vein carries blood that is rich in oxygen back to the heart. Is there anything unexpected about the name of this vein?
A. Veins usually carry blood that has been depleted of oxygen. B. There is nothing unexpected about the name of this vein. C. Pulmonary refers to veins that carry blood to the lungs. D. Veins usually carry blood away from the heart.
Restriction enzymes are naturally produced by and isolated from
A. bacteria. B. bacteriophages. C. human cells. D. plant cells.
Where does photosynthesis take place ineukaryotic cells?
a) Mitochondria b) Ribosomes c) Chloroplasts d) Lysosomes
The microbes used by fermentation industries are mutant strains that synthesize large quantities of the desired product.
Answer the following statement true (T) or false (F)