In Drosophila, the sequential order of the function of segmentation genes is ________
A) pair-rule, transdeterminal, gap
B) gap, segment-polarity, pair-rule
C) gap, pair-rule, segment-polarity
D) transdeterminal, gap, pair-rule
E) segmentational, helical, spherical
C
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The process of carbon dioxide fixation refers to
A. reaction of carbon dioxide with water to form carbonic acid. B. release of carbon dioxide during catabolic reactions. C. reduction of carbon dioxide and incorporation into organic molecules that are assimilated. D. release of carbon dioxide during anabolic reactions.
Which of the following steps in prokaryotic binary fission is INCORRECT?
A. DNA is replicated bidirectionally from a single point on the circular chromosome. B. The two replicated chromosomes remain attached to the plasma membrane. C. The cell continues to grow outward symmetrically, separating the two chromosomes. D. Cell wall material is laid down at the midpoint to separate the two daughter cells. E. Construction of the plasma membrane and cell wall separates the two daughter cells.
The pollen tube grows from the ________ to the ________, where it eventually fertilizes the egg.
A. petal; ovary B. sepal; filament C. anther; style D. stigma; ovule
Which phrase describes the selective permeability of a membrane?
a. the ability of a molecule to pass through a membrane b. the ability of only certain molecules to pass across a membrane c. the need for carrier proteins to transport certain molecules