Vaccines contain
A) memory cells against the pathogen.
B) antigens of the pathogen.
C) antibodies of the pathogen.
D) lymphokines.
E) T cells programmed to attack the pathogen.
B
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Several cases of an emerging infectious disease are reported in workers at a research station that borders a tropical rainforest region. The pathogen is identified as a species of bacteria carried by nematodes that infect mosquitos, and disease transmission occurs in a human host following a mosquito bite. Which organisms should be targeted in the treatment of infected patients?
A. Nematode and bacteria B. Mosquito, nematode, and bacteria C. Mosquito and nematode D. Mosquito and bacteria
In some organisms, crossing-over does not occur, and the homologous chromosomes are held together via some other
mechanism. Even though crossing-over leads to genetic diversity, the absence of crossing-over in these organisms does not prevent the production of diverse gametes. Why is this?
What will be an ideal response?Place the five steps of digestion in most animals with a digestive tube in the proper order
a. absorption ? enzymatic hydrolysis ? mechanical processing ? secretion of enzymes ? elimination b. absorption ? mechanical processing ? enzymatic hydrolysis ? secretion of enzymes ? elimination c. mechanical processing ? absorption ? secretion of enzymes ? enzymatic hydrolysis ? elimination d. mechanical processing ? secretion of enzymes ? enzymatic hydrolysis ? absorption ? elimination e. mechanical processing ? secretion of enzymes ? absorption ? enzymatic hydrolysis ? elimination
Which of these is currently considered the best definition of a gene?
A. A gene codes for either a polypeptide or an RNA molecule. B. A gene codes for a single enzyme. C. A gene codes for a single polypeptide. D. A gene codes for a single protein. E. A gene codes for a particular ribozyme.