Anchoring organs in plants that absorb water and nutrients are referred to as ____
a. stems
b. leaves
c. roots
d. thalli
e. tracheids
ANSWER: e
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Which layer of the digestive tract covers and protects the gut?
A. lumen B. mucosa C. submucosa D. longitudinal muscles E. serosa
A fragile site
a. is found only on the X chromosome. b. occurs in only one of the sister chromatids. c. is associated with cancerous cells. d. is usually not inherited. e. is the result of genomic imprinting
In the electron transport system, the energy used to synthesize ATP comes from the diffusion of ________ from the outer compartment of the mitochondria to the inner compartment
A) electrons B) NADH C) hydrogen ions D) FADH2 E) pyruvate
Which statement is false concerning X chromosome inactivation?
A. It is an accident of evolution. B. It is an example of dosage compensation. C. It is a gene control mechanism. D. It is responsible for the normal development of female embryos. E. It does not occur in males.