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1. In molecules of DNA, the nitrogenous base guanine will only pair with
A microscopes field of view is 2mm in diameter. 1mm is equal to 1000 micrometers (µm). When viewing onion skin cells under this microscope 10 cells could be seen to fill the field of view lengthwise.

Calculate the average length of the onion skin cells in µm.
A microscopes field of view is 2mm in diameter. 1mm is equal to 1000 micrometers (µm). When viewing onion skin cells under this microscope 10 cells could be seen to fill the field of view lengthwise.
Express the diameter of the field of view in µm.
If an interphase cell is treated with cyanide (a metabolic poison), the cell does not divide by
mitosis. However, if cyanide is added right after mitosis has started, the same cell completes
mitosis. Which of the following explains this observation?
A. Metabolic activity ceases during mitosis
B. Cell division does not require metabolic activity
C. Energy required for mitosis is produced and stored in the cell during interphase
D. Mitotic cells make factors that make them resistant to cyanide
During the cell cycle where would you be able to see chromosomes? options: a) interphase b) G1 c) M phase d) Sphase
Explain how binding of GABA inhibits the production of nerve impulses.
Extra Credit (3pts) Consider a voltage-gated sodium channel whose normal threshold membrane potential is -50mV. Suppose mutations have switched the positive and negative amino acids flanking the first transmembrane domain. Please form a prediction and provide your reasoning: Under what conditions will the mutant channel open?
What about the polarity of microtubules in interphase cell, nerve cell, dividing cell and ciliated cell
What is medicated permeability? Discuss the type of mediated permeability.
Which two cell organelles use carbohydrates for their structure in humans?
hint: one is glycocalyx
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