Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the location where the chromosomes can become attached to the spindle microtubules.
B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase.
C. This allows sister chromatids to form.
D. This allows asters to form.
E. This is the only place in the cell where the cyclins and Cdks are located.
Answer: B
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Prokaryotic ribosomes are composed of ____
a. proteins only b. proteins and DNA c. proteins and RNA d. glycolipids and DNA e. glycolipids and RNA
____ will neither hurt nor help the individual's
chances of survival.
a. A beneficial mutation b. A neutral mutation c. A random mutation d. A lethal mutation e. None of these
Which one of the following is a kingdom?
A) Eukarya B) Primates C) Archaea D) Animalia E) Bacteria
The characteristic that enables efficient gas exchange in capillaries is:
a. the very short total length of the capillaries. b. their proximity to the heart. c. thick walls of connective and muscle tissue. d. thin walls that are only one cell wide. e. the long total length of the capillaries.