A 38-year old woman is going to ovulate in about a week. For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis? 

A. About a day
B. 1 week
C. 3 weeks
D. 38 years


D. 38 years

Biology & Microbiology

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The letter “E” in the above figure represents

a. sclerenchyma fibers. b. parenchyma. c. xylem. d. epidermis. e. phloem.

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Which of the following is NOT a function of some

leukocytes? a. engulf and destroy damaged or dead cells b. engulf anything recognized as “nonself” c. call up specific immune responses d. carry out specific immune responses e. secrete substances that initiate blood clotting

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Which members of an ecosystem occupy the first trophic level of a food web?

A. Autotrophs B. Herbivores C. Omnivores D. Carnivores

Biology & Microbiology

Lysosomes are membrane-bound vesicles that arise from what structure?

What will be an ideal response?

Biology & Microbiology