How do biologists define "life"?
What will be an ideal response?
They use a list of properties that collectively describe living things.
Collectively, the following properties characterize living things as different from nonliving things:
1 . They make and use the organic molecules of life.
2 . They consist of one or more cells.
3 . They engage in self-sustaining biological processes such as metabolism and homeostasis.
4 . They change over their lifetime, for example by growing, maturing, and aging.
5 . They use DNA as their hereditary material when they reproduce.
6 . They have the collective capacity to change over successive generations, for example by adapting to environmental pressures.
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Secretions from which part of the male reproductive anatomy in humans produces molecules that stimulate smooth muscle contractions in the uterus of females?
A) prostate gland B) seminal vesicles C) bulbourethral gland D) testes
Which of the following mutations would likely be most dangerous to a cell?
A. Deletion of one nucleotide B. Substitution of one nucleotide for another C. Deletion of three nucleotides
Which of these is NOT a direct factor that controls biotic potential?
A. The age at which reproduction generally begins B. The resources available for each individual C. Reproductive rate D. Predators and pathogens E. Genetic mutations
Radioactive isotopes
A) are frequently added to foods as nutritional supplements. B) can be used in conjunction with PET scans to diagnose diseases. C) do not occur naturally. D) are never incorporated into organic compounds.