During a vasectomy, which structure is cut?
a. epididymis
b. prostate
c. seminiferous tubules
d. seminal vesicles
e. vas deferens
ANSWER: e
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Which statement best describes what ultimately happens to the chemical energy that is not converted to new biomass in the process of energy transfer between trophic levels in an ecosystem?
A) It is undigested and winds up in the feces and is not passed on to higher trophic levels. B) It is used by organisms to maintain their life processes through the reactions of cellular respiration. C) Heat produced by cellular respiration is used by heterotrophs for thermoregulation. D) It is eliminated as feces or is dissipated into space as heat, consistent with the second law of thermodynamics. E) It is recycled by decomposers to smaller and smaller forms until it finally breaks down to form soil.
T cells undergo maturation in the bone marrow.
Answer the following statement true (T) or false (F)
The ________ is the development of high-yield varieties of crops and the use of modern cultivation methods, including the use of farm machinery, fertilizers, pesticides, and irrigation
Fill in the blank(s) with correct word
Which of the following statements about retroviruses is correct?
A) Retroviruses produce mRNA from the integrated viral DNA but produce progeny RNA genome from the genomic RNA template. B) Retroviruses produce both progeny RNA genome and mRNA from the genomic RNA template. C) Retroviruses produce progeny RNA genome from the integrated viral DNA but produce mRNA from the genomic RNA template. D) Retroviruses directly use the genomic RNA for viral protein translation. E) Retroviruses produce both progeny RNA genome and mRNA from the integrated viral DNA.