What is the cilia and flagella
What will be an ideal response?
Ans: several short hairlike cilia or few whiplike flagella move cells through their environments
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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
When a neuron membrane potential goes below its resting value it becomes
a. depolarized. b. hyperpolarized. c. repolarized. d. damaged. e. re-stimulated.
Smooth muscle in the arteriole walls can vasoconstrict or vasodilate, which:a
helps to regulate blood pressure. b. helps to accelerate the flow of blood through the vessels. c. prevents the back flow of blood into the tissues. d. squeezes oxygen out of the blood. e. adds strength to the blood vessels.
Which of the following is the correct sequence for stages of Ehrlichia development in infected host cells?
A) initial body, morula, elementary body B) morula, elementary body, initial body C) initial body, elementary body, morula D) elementary body, initial body, morula E) morula, initial body, morula, elementary body