Why would mowing grass not damage the meristem and inhibit growth in height, but pruning a shrub
would?
What will be an ideal response?
Unlike in eudicots where the most active growing region is internodes nearest a stem apex, in grasses
cell division is limited to a meristematic region at the base of the internode. Damaging the apical
meristem of a eudicot will result in branching rather than growth in height. Mowing does not damage
the meristem, so the grasses grow in height rapidly after damage.
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What hormone(s) are produced and released by the corpus luteum following ovulation?
A) FSH and LH B) estrogen C) progesterone D) both estrogen and progesterone
A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis. D) It has an endospore. E) It is protected by a siliceous case.
What could be a possible consequence if a structural gene's TATA box is mutated?
A. The transcriptional start site may not function properly. B. Transcription may start at a variety of sites. C. Unusable transcripts may be produced. D. The preinitiation complex may form at the wrong site. E. All of the choices are correct.
The protein shugoshin is crucial for meiosis I, because it
A) promotes chiasmata formation. B) condenses chromosomes. C) decondenses chromosomes. D) protects centromere cohesins from degradation by separase. E) attaches microtubules to kinetochores.