Which genetic condition is revealed in the karyotype display shown in the figure above?
a. Turner syndrome
b. Down syndrome
c. cri-du-chat
d. Triple-X syndrome
e. Klinefelter syndrome
B
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Bitter taste cells are located at the ________ of the tongue.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a hypothesis to explain the origin of the eukaryotic cell?
A. A eukaryotic cell evolved first, then incorporated a proteobacterial cell that became a mitochondrion. B. A eukaryotic cell evolved first, then incorporated a cyanobacterial cell that became a chloroplast. C. A cyanobacterial cell became incorporated into an archaeon the same time that eukaryotes developed. D. A eukaryotic cell evolved first, then incorporated a cyanobacterial cell that became a mitochondrion. E. None of the answers options is correct.
Although the genetic contributions of egg and
sperm nuclei are equal, the egg contributes more than the sperm to cell differentiation because of its
a. larger size. b. cytoplasmic determinants. c. proteins. d. cytoplasmic determinants and proteins only. e. cytoplasmic materials, enzymes, mRNA transcripts, and larger size
Slits between the cells of capillary walls serve to
a. allow passage of substances that cannot diffuse through the lipid bilayer of capillary wall cells. b. allow expansion of the capillary diameter. c. allow contraction of the capillary diameter. d. allow lengthening of the capillary. e. shortening of the capillary.