Protists cause four of the following diseases. Which one is the exception?
A. Dysentery
B. Neurotoxic shellfish poisoning
C. Malaria
D. AIDS
E. Trichomonas infections of the reproductive tract
Answer: D
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Compare a pseudocoelom to a coelom.
A. A coelom is completely enclosed by mesoderm whereas a pseudocoelom has an outer covering of mesoderm and an inner one of endoderm. B. A pseudocoelom is completely enclosed by mesoderm whereas a coelom has an outer covering of mesoderm and an inner one of endoderm. C. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by endoderm. D. The pseudocoelom is enclosed by ectoderm and the coelom is enclosed by endoderm. E. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by mesoderm.
Why was it not possible to classify viruses by morphology when they were initially discovered?
a. Initially, their morphology could change during infections. b. Once inside the host, they replicate too quickly to be inspected for discernable shape. c. They are too small to be seen with a standard microscope. d. So many of them have identical morphology but different hosts and modes
B and T cells become activated and divide to produce identical cells when _____
a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen
Gian-Carlo is going to have part of his adrenal cortex removed because of a tumor. After the surgery, he may need ________
A) melatonin and insulin B) oxytocin C) cortisol D) calcitonin