Describe the steps of fertilizing an egg cell.
What will be an ideal response?
1. Sperm makes its way through the corona radiata.
2. Acrosomal enzymes digest a portion of zona pellucida.
3. Sperm binds to and fuses with oocyte plasma membrane.
4. Sperm nucleus enters cytoplasm of oocyte.
5. Cortical granules release enzymes; zona pellucida becomes fertilization membrane.
6. Sperm and egg pronuclei are enclosed in a nuclear envelope.
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PKU can be detected by
a. prenatal karyotyping. b. urine analysis at birth. c. blood tests at birth. d. saliva tests. e. both urine analysis and blood tests at birth.
A cyclist rides her bike up a very steep hill. Which of the following statements properly describes this activity in energetic terms?
a) Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill b) Kinetic energy is highest when the cyclists is at the crest of hill c) The cyclist produces the most potential energy as she cruises down the hill's steep slope d) Potential energy is greatest when the cyclist is at the top of the hill e) both a) and d)
The immotile sperm develop motility in about 18 hours after arriving at the long, coiled tube called the
A. epididymis B. testis C. seminiferous tubules D. vas deferens
The combination of large numbers and small size collectively gives alveoli what characteristic that is essential to their function?
A) easy inflatability B) low surface area C) high surface area D) low air resistance