Contraception (preventing conception) and birth control (preventing live birth) are not quite the same. To which category do "morning-after" pills and mifepristone (RU-486) belong, and why?
What will be an ideal response?
The "morning-after" pills and mifepristone (RU-486) do not prevent conception. They are taken to prevent pregnancy after unprotected sex by preventing embryo implantation. Mifepristone (RU-486) is used to cause the loss of an implanted embryo by blocking the progesterone receptors of endometrial cells. Without functioning receptors for progesterone, the endometrium sloughs off, carrying the embryo with it. Other hormonal medications upset the normal uterine cycle, making it difficult for the embryo to implant itself in the endometrium.
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Which one of the following statements about viruses is incorrect?
A. Most viruses use cellular machinery to replicate their genetic material. B. The genomes of viruses are enclosed in a protein coat and occasionally a lipid bilayer envelope. C. Viruses possess the ability to harness energy from the environment. D. Viruses are valuable tools in biological research. E. Some types of viruses employ replicative cycles involving the integration of their genomes into the genome of the host organism.
In what part or parts of the plant life cycle does
mitosis NOT take place?
a. from zygote to sporophyte b. from spore to gametophyte c. from gametophyte to gamete d. from sporophyte to spores e. Mitosis takes place in all of these parts of the life cycle.
All genetic mutations are harmful to an organism.
Answer the following statement true (T) or false (F)
Which of the following genetic changes would NOT be passed from parent to child?
a. a mutation in a skin cell b. the loss of a chromosome in a sperm cell c. the addition of a chromosome in an egg cell d. a translocation in a gamete