The two chromatids of each replicated chromosome must separate from one another and segregate during
A) mitosis.
B) meiosis I.
C) meiosis II.
D) both mitosis and meiosis I.
E) both mitosis and meiosis II.
E) both mitosis and meiosis II.
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Sponges are mostly found in ________.
A. fresh water ecosystems B. marine ecosystems C. both marine and fresh water ecosystems D. neither marine nor fresh water ecosystems
Plant cells with their cell walls removed are called ________
A) calluses B) protozoa C) protoplasts D) germplasm E) auxins
What is the approximate number of distinct evolutionary branches in the domain Archaea, as revealed by genome sequencing studies?
a. 3 to 4 b. 9 to 10 c. at least 12 d. at least 20
In a single sodium-potassium pump cycle, ATP is used with the result that
A. 3 sodium ions enter and 2 potassium ions leave. B. 2 sodium ion enters and 1 potassium ion leaves. C. 3 sodium ions leave and 2 potassium ions enter. D. sodium and potassium ions enter and water leaves. E. 2 sodium ion leaves and 1 potassium ion enters.