Bacterial viruses are so named because they have prokaryotic cell structures similar to their bacterial hosts.
Answer the following statement true (T) or false (F)
False
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Studies have determined that all of the following except ______ are responsible for the cyclical rise
and fall of arctic hare and lynx populations.
a. predation b. a limited food supply for hares c. predation by other mammals d. intraspecies competition e. disease
Matching I. Choose the one most appropriate answer
for each. 1. ___ abortion 2. ___ abstinence 3. ___ coitus 4. ___ douching 5. ___ ejaculation 6. ___ implantation 7. ___ lactation 8. ___ menopause 9. ___ menstruation 10. ___ miscarriage 11. ___ orgasm 12. ___ ovulation 13. ___ tubal ligation 14. ___ vasectomy A. the production and secretion of milk B. sloughing off of endometrium stops permanently C. induced dislodging and removal of an embryo or fetus from the uterus D. an abortion that occurs spontaneously E. the burrowing of the blastocyst into the uterine lining F. the release of an egg from the ovary G. the release of seminal fluid from the male reproductive tract H. a 100-percent-effective method of preventing conception I. a highly unreliable form of birth control J. the periodic elimination of the uterine lining K. characterized by involuntary muscle contractions, release of tension, and warmth L. sexual intercourse M. sperm and egg cannot meet because a section of oviduct is missing N. cutting and tying of vasa deferentia
The human genome contains approximately 20,000 protein-coding genes, yet it has the capacity to produce several hundred thousand gene products. What can account for the vast difference in gene number and product number?
A) Much of the DNA is in the form of trinucleotide repeats, thus allowing multiple start sites for different genes. B) There are more exons than introns. C) Alternative splicing occurs. D) There are more introns than exons. E) Every gene can be read in both directions, and each gene can have inversions and translocations.
Which of the following is "male" in the life cycle of angiosperms?
A) Endosperm B) Megaspore mother cell C) Seed cone D) Pollen grain E) Embryo sac