Which of the following disorders has X-linked recessive inheritance?
a. sickle cell anemia
b. phenylketonuria
c. Duchenne muscular dystrophy
d. achondroplasia
Ans: c. Duchenne muscular dystrophy
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One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that
A) P, Ca, and Si are NOT cycled in terrestrial environments. B) the P, Ca, and Si cycles do NOT involve redox changes or gaseous forms that can alter Earth's atmospheric chemistry. C) the P, Ca, and Si cycles do NOT involve microbial activity. D) the P, Ca, and Si cycles are NOT affected by global warming or other human activity.
In a typical feedback loop, an integrator involves the ________ system and an effector involves the ________ systems
a. receptor / nervous b. glandular / receptor c. nervous / muscular or glandular d. stimulus / response
Answer the following statements true (T) or false (F)
1.The type of animal behavior that is inborn and does not require experience or learning to be performed correctly is innate behavior. 2.Imprinting is a kind of rapid learning that occurs only during a restricted time, early in the life of an animal. 3.In almost all cases, innate and learned behaviors are determined by both genetics and environment. 4.The scientific study of animal behavior is ethology. 5.If an individual reduces its own fitness for the survival of and reproduction of nondescendant relatives is termed kin selection.
Why are dwarf pea plants shorter than other pea plants?
a. because they produce very little gibberellin hormone b. because they have an altered gibberellin amino acid sequence c. because the enzymes involved in gibberellin synthesis are missing d. because they cannot make any gibberellin