You are assembling a model of a chromosome, but begin having some trouble when you get to the step of forming chromatin loops. If you are unable to resolve this problem, what step of chromosome structure would you be unable to achieve?
A. Nucleosome
B. Solenoid
C. Histone/DNA complex
D. Rosettes
Answer: D
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What happens when a keystone species is removed from a population?
a. decreased intraspecific competition b. increased intraspecific competition c. species biodiversity decreases d. species biodiversity increase
A person with genotype LMLN has the phenotype (blood type) M. Indicate whether the statement is true or false
What explains the increased concentration of Ca++ in the ER?
A) Calcium ions are actively imported from the cytoplasm into the ER. B) Calcium concentration is kept low in the cytoplasm because of its high usage level. C) Calcium cannot enter the plasma membrane through ion channels. D) Calcium levels in the blood or other body fluids are extremely low. E) The Ca ions are recycled from other molecules in the ER.
The tradeoffs that underlie antagonistic pleiotropy** are due to negative effects of _______ on survival. **hint: make sure you can define this term
A. predation B. maximum lifespan C. early reproduction D. competition E. population density