Which of the following proteins is involved in synthesizing messenger RNA in eukaryotes?
A. RNA polymerase I
B. RNA polymerase II
C. RNA polymerase III
D. sigma factor
E. both RNA polymerase I and III
B. RNA polymerase II
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Underground stems are called __________, and they may store __________
a. taproots; starch b. taproots; toxins c. tubers; starch d. tubers; toxins
Photoperiodism is the
a. duration of flowering in a plant. b. amount of light needed by a plant to exhibit normal growth. c. biological response of a plant to a change in the length of daylight relative to darkness. d. light phase of photosynthesis during which photolysis of water occurs. e. time of the day when light shines.
Answer questions 96–100 with reference to the muscles listed
below. a. pectoralis major b. trapezius c. quadriceps femoris d. triceps e. gastrocnemius D 96. This is a principal muscle of the anterior upper leg. M 97. This muscle is located on the upper shoulder. M 98. This muscle opposes the biceps. D 99. The Achilles tendon attaches this muscle to the heel bones. M 100. This is a major muscle in the chest.
In Drosophila and Lepidoptera, sex-chromosome mosaicism produces what type of sexually ambiguous phenotype?
What will be an ideal response?