Tracers are used in what form of medical test?

a. PET scans
b. CT scans
c. sonograms
d. x-rays
e. MRI


ANSWER: a

Biology & Microbiology

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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.

Biology & Microbiology

When the generative cell divides, the daughter cells are sperm cells

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology