In females at puberty, what cells begin to secrete the major female sex hormone, estradiol?
A. Granulosa cells
B. Oocyte cells
C. Follicle cells
D. Corpus luteum
Answer: A
Biology & Microbiology
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A) unwound and stretched. B) repetitive or symmetrical. C) highly coiled. D) bound by RNA polymerase.
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Approximately 65.5 million years ago the Earth experienced a permanent loss of major groups of organisms during an event called ________
a. speciation b. continental drift c. genetic equilibrium d. mass extinction e. directional selection
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what is the average duration of sleep for teens? what is needed?
What will be an ideal response?
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What is the defining characteristic of the hornworts?
a. sporophytes b. broad leaves c. cones d. jointed stems
Biology & Microbiology