The potential causes of chromosomal aberrations include
a. viruses only.
b. radiation only.
c. a set of specific chemicals.
d. viruses and radiation only.
e. viruses, radiation, and various chemicals.
ANSWER: e
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Water diffuses through certain organs such as the kidneys and bladder much faster than would occur by passive diffusion through a lipid bilayer alone. What accounts for this more rapid rate of water transport in these organs?
A. The composition of lipids changes to promote water transport. B. Presence of aquaporin channels for facilitated diffusion of water. C. Presence of a water pump. D. Presence of an ATP-driven enzyme for water transport. E. The presence of molecules that bind water and change its membrane permeability properties.
Answer the following statements true (T) or false (F)
1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. 2. The pace of evolution remains constant despite sudden environmental shifts such as climate change. 3. Although most genetic sequence information is obtained from living species, it is sometimes possible to obtain DNA from small tissue samples of extinct species for use in constructing phylogenetic trees. 4. Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationships among some extinct and living species of flightless birds using tissue samples from museums and from living birds. This is an example of discovery-based science.
Which of the following is NOT considered a peripheral lymphoid tissue?
A) bone marrow B) spleen C) appendix D) adenoids E) tonsils
DNA is found in the ___ of the cell.
What will be an ideal response?