The meshwork that forms the fabric of a blood clot mostly consists of
A. fibrinogen.
B. fibrin.
C. thrombin.
D. prothrombin.
E. collagen.
B. fibrin.
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The number of sperm cells in an ejaculation averages
A) 2,000 to 6,000. B) 20,000 to 60,000. C) 200 to 600 million. D) 200 to 600 billion.
The offspring (F1) resulting from the cross between two red flowered plants are 3/4 red and 1/4 white. The most likely
genotype of both red flowered parental plants (P1) is ____. a. codominant recessive b. incomplete dominant c. incomplete recessive d. heterozygous e. homozygous recessive
Suppose a scientist working on a new drug for cancer developed a chemical that irreversibly breaks the hydrogen bonds in the DNA molecules within cancerous cells but leaves all of the covalent bonds intact
Hydrogen bonds are relatively weak compared to covalent bonds, and they are routinely broken and reformed as the DNA molecule is replicated in a normal cell. Their stability is nonetheless critical for maintaining certain aspects of the structure and function of the DNA molecule. Based on this scenario and your knowledge of DNA, how would this newly discovered chemical affect the "molecule of heredity" in a human cancer cell? A) It would break the individual strands of the DNA molecule apart, preventing it from functioning normally. B) It would result in constant DNA replication within the cell. C) It would break the two strands of the DNA molecule apart, preventing it from functioning normally. D) It would allow the DNA molecule to function normally except during replication.
Two doses of the MMR vaccine provide full protection from infection with the mumps virus
Indicate whether the statement is true or false