In which cellular organelle do the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes occur?
A) Golgi
B) lysosome
C) nucleus
D) mitochondrion
E) cytoplasm
Answer: C
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Which is a major group of enzyme-linked receptors?
a. G proteins b. ion channels c. tyrosine kinases d. phospholipases e. adenylyl cyclases
Which of the following molecule(s) help(s) to hold the DNA strands apart while they are being replicated?
A. DNA polymerase B. single-strand binding proteins C. ligase D. primase
Which of the following facts did Hershey and Chase make use of in trying to determine whether DNA or protein is the genetic material?
a) DNA contains phosphorus, whereas protein does not b) DNA contains nitrogen, whereas protein does not c) DNA contains purines, whereas protein includes pyrimidines d) DNA contains sulfur, whereas protein does not
Which conducts an action potential faster and why?
A. unmyelinated fibers; the ions can move in and out of the cell faster without the myelin coating B. unmyelinated fibers; the absence of myelin allows the action potential to travel faster C. myelinated fibers; the action potential jumps from one node of Ranvier to another D. unmyelinated fibers; the action potential jumps from one node of Ranvier to another E. myelinated fibers; the action potential moves through the myelin which allows it to travel faster