What would happen if telomerase stopped working?
A. The cells would be able to divide
indefinitely.
B. Cancer would result.
C. The cell would die immediately.
D. The cell would eventually die as the DNA
continued to shorten.
E. None of the answer options are correct.
D
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Tropical leafcutter ants collect leaf cuttings which they transport to special underground chambers. There, they chew the leaves to create nursery beds on which they grow a species of fungus they use for food
When ant queens disperse to establish new colonies, they carry the fungus with them, dispersing it as well (this benefits the fungus). In the ants' nest, the fungus is at risk of being destroyed by another fungal species that is able to grow in the same habitat, using the same limited resources. On their bodies, the ants carry and provide a home for bacteria that produce antibiotics the ants use to kill this second fungus and thereby protect their food supply. In this system, the relationship between the leafcutter ants and their fungal food species is: A. interspecific competition. B. mutualism. C. predation. D. parasitism. E. commensalism.
Oxidation
A) involves the removal of oxygen atoms. B) is endothermic. C) occurs when an atom accepts electrons. D) occurs when oxygen is added and energy released. E) both choices B and C
Which of the following statements regarding Fas-mediated programmed cell death is false?
A) Fas ligand binding with Fas receptor stimulates a specific G protein. B) Fas ligand and receptor interaction results in the recruitment of adaptor proteins in the target cell. C) Capases are activated in the process. D) The caspase cascade results in the cleavage of the proteins within the target cell. E) It ultimately results in death of the cell.
These data support the trade-off that
A) size of offspring is correlated with number of offspring. B) size of offspring is correlated with size of mother. C) number of offspring is correlated with survival. D) habitat type is correlated with size of mother.