A cytoskeleton is
A. composed of microtubules, microfilaments, and intermediate filaments.
B. a structure that aids in the process of cell division.
C. found in the cytoplasm of eukaryotic cells.
D. a system of tracks used for intracellular transport.
E. All of the answer choices are correct.
E. All of the answer choices are correct.
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Members of the class ______ have two stomachs, one of which can reach outside of its body to secrete digestive juices onto its prey to liquify it.
a. Asteroidea b. Ophiuroidea c. Holothuroidea d. Crinoidea
A friend tells you that her husband has been feeling anxious and stressed for the past month. During this same time interval, he has had several infections, bouts of forgetfulness, and erectile dysfunction. Doctors have already checked for ulcers, cancer, blood pressure changes, and other blood irregularities, but these apparently are normal. You are an endocrinologist, so you suggest that he be
tested for the most likely endocrine malfunction, which would be altered ____ levels in the blood. a. estrogen b. cortisol c. calcitonin d. melatonin e. testosterone
Pea plant tendrils wrapping around a string demonstrate
A) phototropism. B) lumitropism. C) gravitropism. D) amylotropism. E) thigmotropism.
You have been in chemotherapy for the treatment of cancer for a month. you have developed a Nast Aspergillus (environmental mold) infection in your bronchial tubes. what type of pathogen have you encountered?
What will be an ideal response?