A Barr body is a(n) ____
a. activated X chromosome
b. inactivated X chromosome
c. immature trophoblast
d. immature blastocyst
e. mature blastocyst
b
You might also like to view...
Specific amino acids are attached to tRNA molecules by
A. aminoacyl-tRNA synthetases. B. hydrogen bonds. C. anticodons. D. deactivating enzymes. E. initiation factors.
A thin layer chromatogram is useful for
(a) measuring the amount of photosynthesis. (b) determining the amount of gas produced during photosynthesis. (c) separating pigments based on their physical characteristics. (d) determining the presence of sugars in a leaf.
How many chromosomes should be in an embryo nucleus?
A) 8 B) 16 C) 24 D) 32
In the practice of variolation, how were patients exposed to the smallpox pathogen?
A) Babies were nursed by women who had already had smallpox. B) They were exposed to bedding or clothes of a person with smallpox. C) They were exposed to a bovine version of the disease, which is mild in humans. D) They were exposed to dried scabs from smallpox lesions. E) They were placed in a room with a person who currently had smallpox.