People opposed to stem cell research argue that it is unethical to collect embryonic stem cells because it usually preserves an embryo. If False, change it.
a. true
b. false
Ans: b. false
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Which of the following statements about fertilization in humans is false?
A. The fast block to polyspermy involves modifications to the structure of the zona pellucida. B. Sperm must pass through a layer of follicle cells and the zona pellucida before binding to the egg plasma membrane. C. Chemical cues released from the egg guide the movement of sperm. D. Sperm are incapable of fertilizing an egg before undergoing capacitation in the female reproductive tract. E. The oocyte completes meiosis II only after the plasma membranes of the egg and sperm fuse.
Currently most cancers are diagnosed before metastasis.
Answer the following statement true (T) or false (F)
garden peas, one pair of alleles controls the height of the plant and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). Use this information to answer the following question(s). 10. In the garden peas example above, a tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/2 tall with purple flowers and 1/2 tall with white flowers. What is the genotype of the parents? What will be an ideal response?
Roses are classified as
A) angiosperms. B) bryophytes. C) seedless vascular plants. D) gymnosperms. E) ferns.