What term describes the failure of one species' sperm to fertilize the egg of a different species?
A. Mechanical incompatibility
B. Behavioral isolation
C. Hybrid weakness
D. Gametic incompatibility
Answer: D
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When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the
solution does not change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to this same solution. Based on these observations, the compound Na2HPO4 is: a. able to donate hydrogen atoms to HCl. b. able to remove hydrogen ions from the OH? of NaOH. c. acting as a buffer. d. an enzyme facilitating the reaction between HCl and NaOH. e. acting as a solvent.
Which was the first bacterium to be clearly identified as the cause of an infectious disease?
a. Legionella pneumophila, which causes Legionnaires' disease b. Chlamydia sp., which causes pelvic inflammatory disease in women c. Clostridium botulinum, which causes botulism d. Bacillus anthracis, which causes anthrax e. Vibrio cholerae, which causes cholera
____ is NOT a product of the Kreb cycle.
A. Pyruvic acid B. ATP C. NADH2 and FADH2 D. CO2
A researcher only needs to select a cohort group when implementing an analytical epidemiological study
Indicate whether the statement is true or false