What is the correct order of cell mitosis?
1. telophase
2. metaphase
3. anaphase
4. prophase
A. 1,2,3,4
B. 2,3,1,4
C. 3,2,1,4
D. 4,2,3,1
Ans: D. 4,2,3,1
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The two main types of eukaryotic microtubules are the ________ and ________ microtubules
Fill in the blank(s) with the appropriate word(s).
The age of a fossil can often be determined using radiometric dating of the rocks in which the fossil is found. Because uranium-238 has a half-life of 4.5 billion years, it means that:
A. when it is 9 billion years old, a rock will have no uranium-238 remaining. B. when the earth is 9 billion years old, no uranium-238 will exist. C. a uranium-containing rock that is 4.5 billion years old would, today, have only about half as much of its uranium in the form of radioactive uranium-238 as a rock that was just recently formed. D. uranium-238 cannot be used to establish the age of fossils greater than 4.5 billion years old.
In what order do sperm move through the structures of the female reproductive tract?
A. ovary; oviduct; uterus; vagina B. cervix; vagina; uterus; oviduct C. vagina; uterus; oviduct; ovary D. vagina; cervix; uterus; oviduct E. endometrium; cervix; uterus; oviduct
Which of the following is NOT found in the cell envelope of a Gram-positive bacterium?
A) outer membrane B) cell wall C) cell membrane D) peptidoglycan