A scientist wants to study histones. Histones are
A. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase.
B. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes.
C. proteins that required for the activity of Cdk enzymes.
D. proteins that regulate checkpoints in the mitotic cell cycle.
E. proteins that double-stranded DNA molecules wrap around in eukaryotes.
Answer: E
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Damage to the sinoatrial node in humans _____
A) is a major contributor to heart attacks B) would block conductance between the bundle branches and the Purkinje fibers C) would have a negative effect on peripheral resistance D) would disrupt the rate and timing of cardiac muscle contractions E) would have a direct effect on blood pressure monitors in the aorta
Why are monosaccharides used by body cells?
A) to build membranes B) to produce enzymes C) for energy production D) to store energy
Define the term "trait group."
What will be an ideal response?
Which of the following is a FALSE statement about the difference in gene regulation between prokaryotes and eukaryotes?
A. Eukaryotic genes are usually organized individually, while prokaryotic genes are grouped for common functions. B. Eukaryotic genes are regulated by small effector molecules whereas prokaryotic genes are not. C. Eukaryotic gene regulation is more intricate than prokaryotic gene regulation. D. Eukaryotic genes are arranged into operons, while prokaryotic genes are not. E. Eukaryotic gene regulation tends to require more coordination and integration than prokaryotic gene regulation.