The ABC genes in Arabidopsis are considered homeotic genes. What could be a reason for this classification?
A) Each of the three genes codes for a different flower organ.
B) Each gene codes for regulatory transcription factors.
C) Each gene is similar in sequence to homeotic genes in Drosophila.
D) Each gene codes for proteins similar to Hox genes in mice.
Answer: B
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Which of the following statements is not true of nitrogen-fixing bacteria?
A. They live in root nodules. B. They are very common in symbioses with plants from the legume family. C. They are very common in symbioses in all plant families. D. Some are free-living in the soil. E. They provide an important way that biologically available nitrogen enters ecosystems.
The ovarian cycle produces a(n) ____
a. mature egg b. parthenogenic egg c. embryo d. endometrium e. mature somatic cell
The ______rate is the number of persons afflicted with a certain illness
Fill in the blank(s) with the appropriate word(s).
People who have type AB blood are considered ________ because they ________
A) universalists : cannot receive blood transfusions B) universal donors : have antibodies to A and B C) universal recipients : have antibodies to A and B D) universal donors : have no antibodies to A and B E) universal recipients : have no antibodies to A or B