Four of the five answers listed below are parts of the same sense organ. Select the exception
a. cochlea
b. cornea
c. sclera
d. choroid
e. fovea
A
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Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates. One will differentiate into the endospore, and the other is the sporangium that will ultimately lyse to release the mature endospore. (Review Process Figure 4.24.) During this asymmetric cell division, one of the compartments does not receive an intact copy of the chromosome. Which compartment can function with only part of the genome and why?
A. The endospore; it is a dormant stage and requires very little to maintain its dormancy. B. The sporangium; it supports endospore development and then lyses. C. The sporangium; much of the genome is "junk DNA" and not required for endospore maturation. D. The endospore; the endospore is built from the outside via the sporangium and not from the inside.
Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these
When crossing a true-breeding red snapdragon flower with a true-breeding white flower of the same species, all offspring are pink. This would seem to support the pre-Mendel view that inheritance is a blending of parental traits. However, Mendel and conventional wisdom agree that "blending" of parental traits is not correct and that particles of inheritance are actually involved. Which of the following statements supports the idea of particulate inheritance? Select all that apply.A) Two parents that show the incompletely dominant phenotype produce some offspring that are red and some that are white.B) Over many generations of crossing individuals with the incompletely dominant phenotype, all the progeny are pink.C) There is no way to directly prove that incomplete dominance is not a case
of blending.D) In meiosis, alleles of different genes assort independently of each other during gamete formation. What will be an ideal response?
Which of the following must occur in order to maintain a high pressure potential within guard cells?
A. Stomata must take up more oxygen and less carbon dioxide. B. Energy must be constantly expended. C. Water must exit guard cells by osmosis. D. Potassium ions must be actively transported out. E. The rate of transpiration must increase.