A restriction enzyme is most comparable to a ___________
A. screwdriver D. fork
B. hammer E. ruler
C. pair of scissors
C
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Trichomoniasis vaginalis is a sexually transmitted disease that can also survive on moist surfaces and in urine for several hours. As a result, trichomoniasis
A) is difficult to treat. B) is not a good candidate for eradication. C) can be spread by contact with contaminated toilet seats, sauna benches, and towels. D) is more common in males.
Which of the following molecules would most likely require a transport protein to cross the plasma membrane of a red blood cell?
A. CO2 B. H2O C. O2 D. C6H12O6
Answer the following statements true (T) or false (F)
1. The type of cellular response that is caused by a given signaling molecule depends on the type of cell responding to the signal. 2. Apoptosis can occur via both intrinsic and extrinsic pathways. 3. Apoptosis is necessary in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer. 4. Ligands that promote cell death are typically produced on the surface of cells of the immune system that recognize abnormal cells and target them for destruction.
Which cell type secretes a chemical message
for the purpose of cellular communication?
a. muscle b. neuron c. keratinocyte d. fibroblast e. platelet