Cells at shoot tips maintain their totipotency due to the expression of:
A. meristem identity genes.
B. growth regulation genes.
C. lateral growth genes.
D. S-regulation genes.
E. nodal expression genes.
A
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In a normal fruit fly, the second thoracic segment has wings and the third thoracic segment has halteres (small knobbed structures that act as a balance and guidance system). A mutant fruit fly is identified in which the third thoracic segment produces wings instead of halteres. This abnormal fly has a mutation in which of the following?
A. a maternal effect gene B. a gap gene C. a homeotic gene D. a segment polarity gene
The process by which successful traits become more common in subsequent generations is called ____
a. speciation b. mutation c. natural selection d. genetic drift
e. gene flowWhich of the following pertaining to a cut corpus callosum is FALSE?
a. The right hemisphere doesn't know what the left hemisphere is doing. b. The right hemisphere directed the writing of COW but the person could not say what the word was. c. The right hemisphere directs motor activity on the left side of the body. d. The left hemisphere processes language. e. Information between the right and left hemispheres was shared, but reduced by 50 percent.
Which of the following statements concerning the characteristics of life is FALSE?
A. reproduction is defined as an increase in the size of an organism. B. viruses have some, but not all, of the characteristics of living things. C. organisms may not exhibit all of the characteristics of life at all times. D. reproduction can occur asexually or sexually in living things. E. living things store metabolic energy in the form of chemicals such as ATP.