Long filaments containing microtubules and used for cellular locomotion are called ________, whereas short fibers containing microtubules and used for cellular locomotion are called ________.
What will be an ideal response?
flagella, cilia
flagella; cilia
flagella cilia
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Which of the following types of molecule is secreted by the human brain and acts as a natural pain killer?
1.catecholamine 2.endorphin 3.norepinephrine 4.serotonin
In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are
A) nitrogenous bases linked together. B) nitrogenous bases linked to phosphate. C) deoxyribose linked to sulfate. D) the backbones of the molecule. E) deoxyribose linked to phosphate.
Despite causing a life-threatening disease, the sickle-cell allele in some areas of Africa has remained in high frequency in those populations because it protects against malaria
In the United States, malaria was eradicated shortly before World War II by eliminating the mosquito that spreads the disease. What is likely to happen to the frequency of the sickle-cell allele in African Americans living in the United States? A) The frequency of the sickle-cell allele will decrease. B) The frequency of the sickle-cell allele will not change. C) The sickle-cell allele will disappear from the African American population. D) The normal allele will disappear from the African American population. E) The frequency of the sickle-cell allele will increase.
Explain the techniques used in the cloning of "Dolly."
What will be an ideal response?