What is a limitation of the tree of life phylogenetic model that necessitated the development of newer models?
a. It cannot explain the origin single-cell organisms.
b. It cannot explain vertical gene transfer.
c. It cannot explain horizontal gene transfer.
d. It cannot explain development of organelles.
c. It cannot explain horizontal gene transfer.
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A student is studying the localization of mRNA in the cell. The cells are treated with a monoclonal antibody to a protein contributing to processing (P) body structure. Which part(s) of the cell would most likely show immunofluorescence?
A. nucleus B. cytoplasm C. both nucleus and cytoplasm D. cannot be determined
If a eukaryote cell contains a non-functional mutated form of RNA polymerase II, what result is most likely?
a. The cell will be unable to assemble ribosomes. b. The cell will synthesize non-functional tRNAs. c. The cell will be unable to transcribe most genes. d. The cell will only be impacted during mitosis.
Chlorophyll a appears green because it absorbs mainly _____ light
a. violet and red c. yellow b. green d. blue
An excitatory postsynaptic potential ____.
A. is cancelled out by an inhibitory postsynaptic potential B. has a hyperpolarizing effect C. will drive the membrane away from its potential D. is summed with an inhibitory postsynaptic potential at the input zone of a neuron E. works so that only one impulse can be received at a time