In a dividing fruit fly cell lacking components of the centralspindlin complex,
A) the nuclear envelope remains intact.
B) the centrosome fails to duplicate.
C) sister chromatids fail to separate for anaphase A.
D) no anaphase B occurs.
E) cytokinesis begins, but the cleavage furrow regresses.
Answer: E
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The polymerase chain reaction (PCR) uses ________ and a heat-resistant DNA polymerase to rapidly
increase the number of molecules of a DNA fragment. Fill in the blank(s) with the appropriate word(s).
A heterozygous fruit fly with normal wings and a gray body (VvBb) is crossed with homozygous flies with vestigial
wings and black bodies (vvbb). If there are 800 F1 progeny, the expected phenotypes would be: a. 200 normal gray, 200 normal black, 200 vestigial gray, and 200 vestigial black b. 400 normal gray and 400 vestigial black c. 800 normal gray
d. 800 vestigial black e. 450 normal gray, 150 normal black, 150 vestigial gray, and 50 vestigial black
How do coronaviruses differ from togaviruses?
A. Coronaviruses have an envelope. B. Coronaviruses are RNA viruses. C. Coronaviruses have helical capsids. D. Coronaviruses contain positive RNA. E. Coronaviruses individual capsids can be visualized.
What type of tissue would be found lining the inside of a mouse intestine?
a. Simple squamous epithelium b. Simple cuboidal epithelium c. Smooth muscle d. Simple columnar epithelium e. striated muscle tissue