Gene expression in developing organisms is regulated on several different levels. In many developing animals, regulation of gene expression is influenced by the action of Hox genes. Which of the following regulatory elements is produced by many Hox genes?
A) transcriptional factors
B) cell-surface molecules for cell-cell interactions
C) signals from maternal cytoplasm, such as bicoid
D) mRNA processing factors
Answer: A
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Strong selection against the phenotypes for both homozygotes
a. reduces the equilibrium frequencies of the homozygous genotypes b. completely eliminates the homozygous genotypes c. has no effect on the homozygous genotypes
The atomic number of an atom refers to its ____
a. mass or weight b. number of protons c. number of protons and neutrons d. number of neutrons e. number of electrons
If a person were to stay at high altitudes for a long period of time, his or her hematocrit would increase in order to compensate for the decrease in the amount of oxygen in the air he or she is breathing
Indicate whether the statement is true or false
Pinocytosis would allow the intake of
A. solid food. B. gas. C. molecules dissolved in water. D. All of these answers are true.