Homeotic genes generally control _________________.
A. X chromosome inactivation
B. the formation of a specific body part
C. hormone synthesis.
D. dosage compensation
E. DNA methylation.
Answer: B
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a. tunica intima b. tunica media c. tunica externa d. lumen
A drop in blood volume will trigger the body to
secrete a. parathyroid hormones. b. somatotropin. c. antidiuretic hormone. d. insulin. e. glucocorticoids.
Why are most of the trees in temperate rain forests evergreens?
What will be an ideal response?
A normal Arabidopsis flower is composed of four concentric whorls. Which of the following is the correct order of whorls, starting from the outside and moving in?
A. carpels-petals-sepals-stamens B. sepals-petals-stamens-carpels C. petals-sepals-carpels-stamens D. stamens-carpels-sepals-petals E. carpels-stamens-petals-sepals