The SA node, the __________ spontaneously
generates the action potentials that set the pace
for cardiac contractions. Fill in the blank(s) with the appropriate word(s).
Answer: cardiac pacemaker
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A frameshift mutation could result from _____
A) a base insertion only B) a base deletion only C) a base substitution only D) deletion of three consecutive bases E) either an insertion or a deletion of a base
Summarize the usefulness of the online catalog of human genetic traits developed and maintained by researchers at
Johns Hopkins UniversityWhat will be an ideal response?
Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide
b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
A mutation in the DNA-binding domain of a steroid hormone receptor is most likely to affect what aspect of receptor function?
A. the cellular response to the hormone B. the translocation of the receptor to the nucleus C. the binding of the hormone to the receptor D. the conformational change of the receptor