Which of the following parasites is NOT generally microscopic in its mature form, even though microbiologists usually study them?
A) amoebae
B) toxoplasmas
C) helminths
D) leishmanias
E) cyclosporas
C
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The process of imprinting of a gene:
A. ensures that both alleles of a particular gene contribute to the phenotype. B. is a mechanism to completely shut down the expression of an allele derived from one parent in a diploid cell. C. relies on the DNA sequence alone. D. All of the choices are correct.
____ are examples of trace fossils
a. Skeletons b. Shells c. Seeds d. Footprints e. Leaves
As DNA is being replicated, new nucleotides are covalently bonded to the _____of the growing strand
1.free hydroxyl group on the deoxyribose of the 3' end 2.free hydroxyl group on the deoxyribose of the 5' end 3.nitrogenous base of the last nucleotide on the 3' end 4.nitrogenous base of the last nucleotide on the 5' end 5.free hydroxyl group on the ribose of the 3' end
You a given a plant tissue in lab and asked to determine if the tissue is a source or a sink. Microscopic analysis reveals an abundance of colorless parenchyma cells with plastids. Only one biochemical test reacts positively with your sample. In the presence of iodine, the plastids turn a dark purplish color. Based on this information you determine your sample is
A. a sink because your sample is rich in carbohydrates. B. a source because your sample is rich in carbohydrates. C. a source because your sample contains plastids. D. both a source and sink because it contains both plastids and carbohydrates.