What do scientists attribute to the remarkable survival abilities of the tardigrades?
a. like a virus, they are not truly alive
b. the ability to mutate their DNA intentionally
c. unique protective proteins that replace the water in their cells
d. they are alien life visiting this planet
c. unique protective proteins that replace the water in their cells
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What is the cyncytium?
a. rod-like structures discharged from mucus in free-living flatworms b. a layer of cells formed by nuclear division without cytokinesis c. a layer of fused cells that covers muscle layers in flatworms d. a nerve structure associated with photosensory cells in tapeworms
The primary producers for hydrothermal vent ecosystems are
a. chemoautotrophs b. chemoheterotrophs c. phytoplankton d. cyanobacteria e. algae
You are looking under the microscope at a cell undergoing cell division. You stain your slide with a chemical that will highlight the kinetochores. The areas highlighted would be expected to correspond to which type of chromatin?
a) facultative euchromatin b) constitutive euchromatin c) facultative heterochromatin d) constitutive heterochromatin
Lactose intolerance is the inability to
A) produce milk proteins. B) produce lactose. C) digest cellulose. D) digest lactose.