Your friend was diagnosed with strep throat 2 months ago. She was treated with antibiotics for 10 days, but two weeks after treatment, the symptoms returned
She was given a different antibiotic and her symptoms improved again, initially, but then got worse. What is happening? A) Your friend has taken antibiotics so long that she has become tolerant to them, making them ineffective.
B) Exposure to antibiotics has caused each individual bacterial cell to evolve resistance to the antibiotics.
C) Your friend was originally infected with some bacteria that were resistant to these two antibiotics and the bacteria multiplied.
D) Your friend probably doesn't have a bacterial infection. There must be some other reason for her symptoms.
C
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The value for ? in root tissue was found to be -0.15 MPa. If you take the root tissue and place it in a 0.1 M solution of sucrose (? = -0.23 MPa), the net water flow would _____
A) be from the tissue into the sucrose solution B) be from the sucrose solution into the tissue C) be in both directions and the concentration of water would remain equal D) occur only as ATP was hydrolyzed in the tissue E) be impossible to determine from the values given here
The funnel-like chamber of the kidney that collects urine is called the
A) smooth muscle. B) glomerulus. C) renal pelvis. D) renal medulla. E) renal cortex.
Which muscle cells are designed for endurance?
A) hemoglobin B) slow-twitch cells C) fast-twitch cells D) myoglobin
Which of the following is the large lymphoid organ in the abdomen that produces and stores large amounts of white blood cells?