Spindles are ___.
A. permanent cell structures
B. present throughout every step of mitosis
C. present during interphase
D. mainly composed of microtubules
E. all identical
Answer: D
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Albinism is a recessive trait controlled by a single gene. If the frequency of albinos in a population is 0.25, what is the
expected frequency of heterozygotes for this trait? a. 0.25 b. 0.50 c. 0.75 d. 0.90 e. 1.00
Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called ________.
Fill in the blank(s) with the appropriate word(s).
What type of root system do you see on the dandelion at the right?
What will be an ideal response?
Cytotoxic T cells are best characterized by the following cell-surface marker
A. CD4 B. CD8 C. CD3 D. CD2