Which of the following allow communication between the cells of the heart muscle tissue, resulting in the coordinated beating of the heart?
a. tight junctions
b. anchoring junctions
c. desmosomes
d. gap junctions
Ans: d. gap junctions
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Facilitated diffusion differs from simple diffusion in that facilitated diffusion __________.
a. is an ion pump b. needs ATP c. requires a protein carrier d. doesn't need a gradient e. requires a protein carrier
Which of the following includes other levels of hierarchy?
a. kingdom b. domain c. order d. phylum e. family
Embryonic stem cells are pluripotent, able to ____
a. divide an unlimited amount of times b. give rise to most, but not all body cell types c. give rise to any of the body cell types d. divide a limited amount of times e. give rise to different, unique individuals
The DNA phage ??174 was found to have a ratio of bases of 25A:33T:24G:18C. This departs from the usual A/T = 1 and G/C = 1 ratios. How can you explain this?
What will be an ideal response?