There are not many species of fish living deep in the oceans, but the deep-sea fish occasionally pulled up by fisherman have been bizarre creatures, such as the deep-sea anglerfish with its giant fangs and bioluminescent lure. Why have these fascinating deep-sea fish never been shown live on exhibit in an aquarium?
A. They might frighten visitors.
B. They are adapted to cold temperatures and total darkness.
C. Their diet is too specialized.
D. They are adapted for high pressure, and will die at low pressure.
Answer: D
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Which one of the following statements about homeotic, or Hox, genes is not correct?
A. Drosophila contain 8 Hox genes arranged in two clusters, the Antennapedia complex and the Bithorax complex. B. Hox genes are arranged in order according to their relationship with the anterior-posterior segmentation. C. Timing of expression corresponds to chromosomal order and location of expression. For example, anterior genes "turn on" earlier compared to those expressed in the posterior. D. The linear order of Hox genes along the chromosome, the anterior-posterior orientation of the embryo, and timing of expression for the genes in Hox clusters is observed only in Drosophila. E. Many of the genes in the mammalian Hox clusters have redundant or overlapping functions.
What is the term for manipulating the molecular basis of inheritance via recombinant DNA technology?
A) Restriction fragment length polymorphism (RFLP) B) Biotechnology C) Mendelian genetics D) Polymerase chain reaction (PCR) E) DNA fingerprinting
White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?
A) Mix the blood in a salty solution to cause the RBCs to lyse. B) Mix the blood in an isotonic solution and allow the WBCs to float to the top. C) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse. D) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse.
The ________ is the distance between the center of a lens and the point at which it focuses parallel beams of light.
Fill in the blank(s) with the appropriate word(s).