What is the correct order of these mitotic events?
A Chromosomes align on the midplate of the cell.
B Kinetochores begin attaching to spindle fibers.
C Nuclear membrane reforms and chromosomes decondense.
D Chromosomes condense and centrosomes migrate to opposite sides of nucleus.
E Sister chromatids separate and move to opposite poles.
A) BDACE
B) DABEC
C) DBAEC
D) ABDCE
E) EDBAC
C) DBAEC
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Cross bridges can form between actin and myosin when ________
a. troponin is bound to calcium ions b. tropomyosin wraps around actin and covers myosin binding sites c. all of the choices d. calcium pumps transport calcium ions back into the sarcoplasmic reticulum
Mendel's dihybrid crosses (but not his
monohybrid crosses) showed that
a. some genes were linked together. b. the two alleles controlling a trait were divided equally among the gametes. c. alleles for different traits were inherited independently. d. one of the pair of alleles is dominant to the other. e. the crossing of two different homozygous forms will not produce any offspring in the first generation that would look like either of the parents.
Examination of a phenotype can always determine the genotype of an organism
__________________ Indicate whether the statement is true or false.
A shortened snout and a relatively flat face are associated with
A. bilateral symmetry and aquatic reproduction. B. a decline in the importance of smell and an increase in reliance on vision. C. a terrestrial life style. D. a decline in the importance of vision and an increase in reliance on smell.