Land vertebrates evolved which of the
following to help maintain water balance?
a. circulatory system
b. thyroid
c. kidneys
d. liver
e. none of these
C
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In the lactose operon, a P mutant would have a mutation in the ________ region of the operon.
Fill in the blank(s) with the appropriate word(s).
The inheritance pattern of daisy flower color provides an example of what type of gene interaction?
A) additivity B) recessive epistasis C) reciprocal recessive epistasis D) dominant epistasis E) redundancy
Which of the following occur in telophase I of meiosis?
a. nuclear envelope formation b. pairing of homologues c. formation of a bipolar spindle d. crossing over e. condensation of chromosomes
In a tropical rain forest, the majority of animals are found
A) on the forest floor. B) in the towering treetops. C) in the shorter trees. D) in the cleared areas. E) in the soil.