Food chains are sometimes short because _____
A) only a single species of herbivore feeds on each plant species
B) local extinction of a species causes extinction of the other species in its food chain
C) most of the energy in a trophic level is lost as it passes to the next higher level
D) predator species tend to be less diverse and less abundant than prey species
E) most producers are inedible
Answer: C
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Select the statement that correctly describes the roles of histone and nonhistone proteins found in chromatin?
A) Only histones have a structural role in chromatin. B) Only nonhistone proteins have a structural role in chromatin. C) Histone proteins function primarily in chromosome segregation. D) Both histone and nonhistone proteins have a structural role in chromatin. E) Nonhistone proteins function only in replication and chromosome segregation.
Gene testing allows the parents to learn more about their child in the prenatal period. However, there are genetic disorders, such as Huntington's disease, that show no phenotypic signs until age 35
This disease is caused by a dominant allele, resulting in degeneration of the brain, muscle spasms, and death within a decade or two. Because it is caused by a dominant allele, 50% of the offspring will carry the disease. If you knew that someone in your family had Huntington's disease, would you get tested early on, before you start a family and have your own children? Would you rather not know your fate, even if it means that you may pass the dominant allele of this disease to your offspring? (Note: Before being tested, a person usually undergoes a battery of psychological tests to make sure that he or she is emotionally stable enough to deal with knowing that he or she will develop the disease and that there is no cure.)
Check all of the main functions of MADS box-containing genes in plants.
A. root development B. the transition from vegetative to reproductive growth C. generation of leaf form D. floral organ identity
What characteristics differentiate monotremes from other mammals?
What will be an ideal response?