What separates the thoracic cavity from the abdominal cavity?
A. the trachea
B. the bronchus
C. the diaphragm
D. the pleural membrane
Answer: C
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Cell walls are used by many different organisms for protection from their environment and structural support. These cell walls must obviously be insoluble in water; otherwise, they would dissolve the first time an organism got wet
Which of the following carbohydrates would you expect to be most soluble in water? A) starch B) peptidoglycan C) cellulose D) chitin
Refer to the figure. To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae
They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? A) The CO2 acceptor concentration would decrease when either the CO2 or light are cut off. B) The CO2 acceptor concentration would increase when either the CO2 or light are cut off. C) The CO2 acceptor concentration would increase when the CO2 is cut off, but decrease when the light is cut off. D) The CO2 acceptor concentration would decrease when the CO2 is cut off, but increase when the light is cut off. E) The CO2 acceptor concentration would stay the same regardless of the CO2 or light.
nitrogen fixation back into nitrogen gas process
What will be an ideal response?
Which of the following is not true about cervical cancer, which is a relatively common cancer?
a. It can be detected early by a PAP test. b. It is usually caused by human papillomavirus (HPV). c. It causes the cervical cells to make peptide E7, which disrupts the cell cycle. d. It spreads by blocking the retinoblastoma protein RB. e. It usually remains localized.