In animal cells, ____ radiating from the cell center anchor organelles such as the ER and Golgi complex, and provide
tracks for vesicle movement.
a. microfilaments
b. microtubules
c. laminins
d. actins
e. cytokeratins
ANSWER: b
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Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to signal contraction by the muscle cell. B. A cell-surface receptor on the muscle cell is activated by acetylcholine binding. C. Upon activation, the acetylcholine receptor on the neuron undergoes a conformational change to activate an ion channel in the muscle cell. D. An opened ligand-gated ion channel allows sodium ions to rush across the plasma membrane to the inside of the muscle cell. E. A sudden influx of sodium ions across the plasma membrane drastically reduces the membrane potential and activates the contractile machinery of the muscle cell.
Which of the following is not true of cloning vectors?
A. They contain at least two replication origins. B. They can be replicated within an appropriate host. C. They usually contain multicloning sites or polylinkers. D. All of these are true of cloning vectors.
In eukaryotic cells,
a. the bulk of the control of gene expression is at the level of transcription just like in prokaryotes b. mRNAs tend to remain stable for about the same length of time c. mRNAs can have their activities altered through modifications such as phosphorylation d. promoters of genes that are transcribed remain part of heterochromatin e. genes that are involved in similar processes are clustered together in operons
The cytoplasm is not considered a cellular organelle.
Answer the following statement true (T) or false (F)