Female silk moths secrete a pheromone as a(n)
a. way to gather young when they scatter.
b. message to stay close to the cocoon.
c. alarm signal.
d. sex attractant.
e. territory marker.
Answer: d
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A cell's plasma membrane contributes to homeostasis by:
A. acting as a selective barrier. B. defining the boundary between the inside and outside of the cell. C. functioning as a fluid mosaic of lipid and protein. D. maintaining the shape of the cell.
The step of translation in which release factors bind to a stop codon is
A. mitosis. B. initiation. C. transcription. D. elongation. E. termination.
A paracentric inversion heterozygote contains a normal chromosome with the long-arm gene order GENE and an inverted chromosome with the long-arm gene order GNEE. They form an inversion loop to pair during prophase I of meiosis
If a single crossover occurs between the G and the E segments of the loop, what will be the gene orders in the resulting recombinant dicentric chromosome and acentric fragment? Assume crossing over occurs at the four-strand stage involving two nonsister chromatids.
Consider the biochemical pathway below, where A, B, and C are substrates and products and E1 and E2 are the enzymes that catalyze the reactions. If Enzyme 1 (E1) is inactive, which of the following compounds will accumulate?
A>e1>B>e2>C C only B only A only B and C A and B