Ommatida are light-focusing elements found in insects and crustaceans that have:
A. eyecups
B. compound eyes
C. single-lens eyes
D. heat-seeking photoreceptors
B
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Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) all of the above
Certain types of mites can often be found attached to insects such as cockroaches and beetles
Often they are found around the mouth regions of their host, and they feed on any food particles around the mouth of the insect. This is likely what type of relationship?
a. commensalism b. mutualism c. parasitism d. predation
One hypothesis that has been proposed regarding the origin of life suggests that life evolved from an "RNA world" to today's "DNA world
" Considering the properties of RNA and DNA molecules, which questions would direct an investigation of the most insightful test(s) of this hypothesis? A) Is it likely that RNA molecules functioned as ribozymes to synthesize DNA from amino acids, and that this role was reversed when DNA became the information source? B) Is it likely that simple, yet stable RNA molecules served as a primitive precursor to a less stable DNA molecule that was more capable of storing more information? C) Could RNA have provided a template for DNA assembly, thereby enabling a more stable molecule that is replicated more accurately? D) Since ribozymes could freely enter and leave the vesicles, could these molecules have brought external DNA into the cell as a less stable, but more reliable storage molecule of double-stranded DNA?
Baculovirus genomes are 133.9 kb long and encode over 150 genes. This suggests that
A. their protein coats consist of very few types of protein subunits. B. their genetic material is DNA. C. they have a small host range. D. their protein structures are very complex. E. their genetic material is RNA.