Which of the following is false concerning stem
cells?
a. They are undifferentiated cells.
b. They arise from a fertilized egg.
c. They can be coaxed to differentiate.
d. They are obtained from a portion of a plant
body.
e. They may help mend damaged tissue.
Answer: d
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The accepted explanation for the disappearance of the dinosaurs is _____
a. the result of an asteroid impact b. the loss of food sources c. competition by mammals d. gas emissions from volcanoes e. giant tsunamis caused by earthquakes
The average number of children born to women of a population during their reproductive years is the
a. total fertility rate (TFR). b. birth rate. c. growth rate. d. population density. e. reproductive capacity rate (RCR).
The secretions of the ________ contain fructose and prostaglandins
Fill in the blank(s) with correct word
Match each of the main classes of spindle microtubules from list 1 with their functions and features from list 2
List 1 List 2 (A) Interpolar microtubules 1. Stabilized by interactions with each other via motor proteins (B) Aster microtubules 2. Interact with the cell cortex (C) Kinetochore microtubules 3. Link chromosomes to a spindle pole 4. Depolymerize to promote anaphase A 5. Depolymerize to promote anaphase B