Tracers are used in what form of medical test?
a. PET scans
b. CT scans
c. sonograms
d. x-rays
e. MRI
ANSWER: a
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If a helical turn is removed from a closed-circular DNA molecule:
A. only supercoiling will occur. B. only strand separation will occur. C. supercoiling and/or strand separation will occur. D. cruciform DNA will likely form. E. solenoidal DNA will likely form.
When the generative cell divides, the daughter cells are sperm cells
____________________ Indicate whether the statement is true or false.
What type of molecule carries amino acids to the ribosome during protein synthesis?
a. tRNA b. mRNA c. short proteins d. start codons e. RNA polymerase
How are chromosomes maintained in the equatorial plane during mitotic metaphase?
a) by binding to the metaphase plate b) by a tug-of-war between balanced pulling forces exerted by chromosomal spindle fibers from opposite poles c) by a tug-of-war between balanced pulling forces exerted by polar spindle fibers from opposite poles d) by a tug-of-war between balanced pulling forces exerted by astral spindle fibers from opposite poles