Which of the following statements about the angiosperm embryo sac is FALSE?
A. It contains eight nuclei.
B. It is the gametophyte generation of the plant.
C. The nuclei within the embryo sac are diploid.
D. The synergids flank the egg cell.
E. The embryo sac nuclei are the product of mitotic division of a megaspore.
C. The nuclei within the embryo sac are diploid.
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The perception of a certain pitch of sound depends partly on which of the following?
A. the amplitude of the sound waves B. which bones of the middle ear are moved C. which hair cells of the cochlea are stimulated D. where particles settle in the semicircular canals E. whether it is the round window or oval window that vibrates
Some cells retain the capacity to divide throughout their life cycle, whereas others do not divide in adulthood. Give one example of each type
What will be an ideal response?
If your UV detector showed higher levels of UV radiation than normal, you might suspect changes in what layer of the atmosphere?
A. benthic zone B. ozone layer C. cumulus clouds D. particulate layer E. profundal zone
In nature, RNAi protects cells against infection by what kind of pathogen?
What will be an ideal response?