Cri-du-Chat syndrome is caused by a
A) reciprocal translocation between chromosomes 2 and 20.
B) paracentric inversion of chromosome 21.
C) deletion of part of chromosome 5.
D) non-reciprocal translocation between chromosomes 14 and 21.
C) deletion of part of chromosome 5.
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Which is the most common form of asexual reproduction in fungi?
a. budding b. binary fission c. formation of spores d. fragmentation
Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because ________.
A. humans do not use folic acid B. humans synthesize folic acid by a process that is not sensitive to sulfonamides C. humans do not synthesize folic acid but obtain it in their diets D. None of the choices are correct.
The molecular fragment (the G, U and A’s) represented in the accompanying figure is:
a. ATP.
b. RNA.
c. DNA.
d. a nucleotide.
e. a polysaccharide.
Choose the membrane molecule responsible for aiding passage of polar molecules into and out of the cell.
A. cell surface proteins B. transmembrane proteins C. carbohydrate chains D. phospholipids