Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits ions from entering the cell via active transport.
B. The chemical prohibits binding of a ligand to the receptor.
C. The chemical causes ions to move in the opposite direction of the ion gradient.
D. The chemical prohibits second messenger signaling.
Answer: B
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Which repair mechanism is an error-prone system that uses bypass polymerases to replicate short segments of daughter strands whose normal replication is blocked by lesions in template strand DNA?
What will be an ideal response?
Which of the following is not characteristic of neurotransmitters?
a. They are released in response to calcium ions. b. They are chemical messengers that signal neurons, muscles, or glands. c. They are stored within synaptic vesicles. d. They are transported down axons to the synaptic terminals. e. They move via diffusion across the synaptic cleft
A(n) ________ is a substance that accepts hydrogen ions or, when it dissociates in water, will give off hydroxide ions
Fill in the blank(s) with correct word
Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that
A. virulent bacteria can transform nonvirulent bacteria. B. the phage coat contains the genetic material. C. DNA replication is semiconservative. D. A always pairs with T and G always pairs with C. E. DNA functions as the genetic material.