What is the fate of the electrons that interact with a specimen in an electron microscope?
a. They are reflected by the specimen.
b. They are refracted by the specimen.
c. They may be absorbed, reflected, or refracted by the specimen.
d. They are absorbed by the specimen
Answer: c. They may be absorbed, reflected, or refracted by the specimen.
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A human fetus that has the genotype XO will be designated female because:
A. female sex is determined by the presence of a gene on the X chromosome. B. female sex is determined by the absence of TDF, a protein produced by a gene on the fetus's Y chromosome. C. female sex is determined by only one X chromosome. D. female sex is determined by the presence of TDF, a protein produced by a gene on the fetus's X chromosome.
The brain stem includes the __________ and __________, which control reflexes involved in
breathing and other essential tasks. Fill in the blank(s) with the appropriate word(s).
What phase does it occur when each pole of the cell now has one new daughter nucleus, each with a haploid number of chromosomes
What will be an ideal response?
If there is 24% guanine in a DNA molecule, then there is _____ cytosine
A) 24% B) 26% C) 48% D) 52% E) impossible to determine