Which is usually true of archaea?
A. They are found as rods, spheres, or spirals.
B. They reproduce by binary fission.
C. They contain rigid cell walls.
D. They are found as single cells.
E. All of the choices are correct.
E
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During menopause, ____
a. estrogen levels rise b. menstruation increases c. ovulation ceases d. women experience chills e. weight loss is typical
Which of the following features are used to identify chordates?
A) A hollow nerve cord B) A notochord C) A tail during embryonic development D) All of the above are features used to identify chordates.
Which process could be compared to how rushing steam turns a water wheel?
A) the citric acid cycle B) ATP synthase activity C) formation of NADH in glycolysis D) oxidative phosphorylation E) the electron transport system
Challenges in developing effective antiviral drugs with minimal side effects to the patient include
A) only the attachment stage of the viral life cycle is a suitable target for antiviral drug action. B) viruses have many more chemically distinct targets than living pathogens. C) the immune system is rarely successful in ending viral infections so there is no natural model to work from. D) viruses use the cell's own machinery and metabolism for replication. E) drugs can be easily delivered to reach viruses within host cells.