The CYP26B1 protein is closely related in humans, mice, rats, and zebrafish. What does this likely indicate about its
role in germ cell development?
a. CYP26B1does not regulate germ cell development.
b. CYP26B1regulates germ cell development in humans and rats but not in mice and zebrafish.
c. CYP26B1's role in regulating germ cell development is conserved.
d. CYP26B1's role in regulating germ cell development varies largely among species.
e. It is impossible to draw any conclusions from this finding.
ANSWER: c
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Answer the following statements true (T) or false (F)
1. Viruses can infect plants and animals, but none known that infect bacteria. 2. Many viruses are inhibited by antibiotics. 3. "Life" is defined for any particle, substance, or object as anything which is not dead. 4. The kingdom is the most all-inclusive taxonomic category. 5. The cell is the basic unit of life.
The raw materials used for photosynthesis include
a. O2. b. C6H12O6. c. CO2 & H2O. d. CH2O.
Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?
A) glucose B) proteins C) fatty acids D) Such yeast cells will not be capable of catabolizing any food molecules, and therefore, will die.
Serological testing is based on the fact that
A) all bacteria have the same antigens. B) antibodies react specifically with an antigen. C) the human body makes antibodies against bacteria. D) antibodies cause the formation of antigens. E) bacteria clump together when mixed with any antibodies.