The photosystems in chloroplasts contain hundreds of chlorophyll molecules, most of which are part of _______________
(a) plastoquinone.
(b) the antenna complex.
(c) the reaction center.
(d) the ferredoxin complex.
(b)
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Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the only place in the cell where the cyclins and Cdks are located. B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase. C. This is the location where the chromosomes can become attached to the spindle microtubules. D. This allows asters to form. E. This allows sister chromatids to form.
Which of the following causes a decrease in the PO2 of air as it enters the conducting zone of the lungs?
A) warming of the air B) decreasing alveolar PO2 C) the consumption of oxygen D) humidifying the air E) the increasing PCO2
Which of the following is NOT a cause of increasing CO2 levels?
A) burning of fossil fuels B) home energy use C) production of manufactured goods D) creating compost piles from vegetable waste
Choose the letter of the best match from the following:A. protodermB. vascular cambiumC. apical meristemD. procambiumE. ground meristemLateral meristem that contributes to the increase in thickness of a stem or root.
Fill in the blank(s) with the appropriate word(s).