Xylem tissues transport
A. organic molecules.
B. sperm.
C. water.
D. eggs.
C. water.
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A woman has been treated three times for trichomoniasis, and each time the symptoms disappear for a couple of weeks and then return. She indicates that she has been in a monogamous relationship and that her partner has experienced no symptoms. Which of the following is the most likely explanation for her repeated infections?
A. The woman has been misdiagnosed and has a yeast infection which will need a different antimicrobial. B. The woman is allergic to the prescribed antimicrobials. C. Her partner has an asymptomatic infection and keeps re-infecting her. D. The Trichomonas has become resistant to the antimicrobial that was prescribed.
Most eukaryotic cells contain mitochondria, but a few single-celled eukaryotic organisms found in oxygen-free environments do not
Which of the following observations led biologists to reject the hypothesis that these mitochondria-free eukaryotes evolved BEFORE the endosymbiotic event that established mitochondria in other eukaryotes? A. All eukaryotes exhibit some sort of energy utilization. B. Some eukaryotes don't have mitochondria, they have chloroplasts instead. C. The nuclear genome of these mitochondria -free eukaryotes contains relics of mitochondrial genes. D. All eukaryotes have remnant chloroplast genes.
When one cell goes through cell division, it produces ________
A) two identical cells B) two different cells C) four identical cells D) four different cells
Biological hazardous waste bags should be what color?
a. Green or Blue b. Red or Red-Orange c. Clear or Black