HIV may be transmitted from one individual to another by holding hands
Indicate whether the statement is true or false
FALSE
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The pentose phosphate pathway produces
A. glyceraldehyde 3-phosphate. B. NADPH. C. CO2. D. All of the choices are correct.
Why are viruses called obligate intracellular parasites?
a) They must use a host cell's amino acids to synthesize proteins. b) They must use a host cell's nucleotides for transcription and replication. c) They must use a host cell's metabolic enzymes and pathways to obtain energy. d) They must use a host cell's ribosomes to synthesize proteins. e) All of the above.
Over the last 50 years, scientists have recorded an increase in the average atmospheric carbon dioxide. Which of the statements would be the best reason for these findings?
A) Removal of large sections of rain forests through deforestation. B) Testing equipment has become more sophisticated allowing scientists to get better results. C) Atmospheric carbon dioxide increases normally in a 50-year time span. D) More organisms exist on Earth's surface now compared with 50 years ago.
Which of the following is involved in unconscious contraction responsible for dilating or constricting your blood vessels and airways?
a. Simple squamous epithelium b. Simple cuboidal epithelium c. Smooth muscle d. Simple columnar epithelium e. striated muscle tissue