The ____ cells are stimulated by ____ to secrete testosterone
a. Sertoli; LH
b. Sertoli; FSH
c. Leydig; LH
d. Leydig; FSH
e. Sertoli and Leydig; LH
ANSWER: d
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We typically think of phloem as transporting carbohydrates throughout vascular plants. What other substances can travel through the phloem? Select all correct choices
A. hormones B. RNA C. amino acids D. ions
The carrying capacity of an environment is determined by:
a. the net rate of reproduction of the female members b. natural disasters c. the predation rate on the females d. diseases suffered by both sexes e. the sustainable supply of resources it provides
Why is variegation in four o'clock plants determined by the phenotype of the ovule source?
A) The mitochondria determine the leaf coloration, and the mitochondria are inherited through the ovule. B) Dominant genes demonstrating variegation come from the ovule. C) Recessive genes demonstrating variegation come from the ovule. D) The ovule nuclear genome contains the genes for leaf coloration. E) The chloroplasts determine the leaf coloration, and the chloroplasts are inherited through the ovule.
Hominids are characterized by
a. further expansion and elaboration of the brain. b. bipedalism. c. omnivorous feeding behavior. d. further expansion and elaboration of the brain and bipedalism. e. further expansion and elaboration of the brain, bipedalism, and omnivorous feeding behavior.