Which of the following is NOT true of human chromosomes?
A) The haploid number is 23.
B) Human gametes end up with one of each type of 23 chromosomes.
C) Human gametes end up with two of each type of 23 chromosomes.
D) The diploid number is 46.
E) There are 23 pairs of chromosomes.
C
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Molecules that convey positional information and promote developmental changes are called _______
A. morphogens B. determined C. totipotent D. apical
Any agent that can potentially cause cognitive, behavioral or physical harm to the developing embryo or fetus is a(n) ______.
a. psychoactive drug b. disease c. teratogen d. trophoblast
How were nitroglycerine's therapeutic benefits discovered?
a) the fact that dynamite factory workers with heart conditions had less angina on days that they worked b) by reading the literature c) through careful drug testing d) the fact that dynamite factory workers with heart conditions had more angina on days that they worked e) by prayer
In __________, the mouth forms from the second opening.
Fill in the blank(s) with the appropriate word(s).