Which of the following is typical of cancer cells?
a. Products of oncogenes inhibit mitosis.
b. Benign tumors invade normal tissue.
c. Malignant cells migrate.
d. Cancer cells lose the ability to divide.
e. The parent cell of the tumor contains a single mutation in a single checkpoint gene.
ANSWER: c
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Translation begins when the DNA in a chromosome unwinds and one strand is used as a template to make a pre-mRNA molecule
a. True b. False Indicate whether the statement is true or false
The resting potential across a typical neuron membrane is approximately ____ inside relative to outside
a. -70 microvolts b. -70 millivolts c. -70 volts d. +70 millivolts e. +70 megavolts
Which of the following is generally accepted as the origin of living organisms?
a. Life was seeded on Earth from some distant place by meteorites and comets crashing into Earth. b. Spontaneous generation c. Life originated from an oxygen-rich atmosphere on Earth. d. Life can originate from nonliving matter. e. Prebiotic chemical evolution gave rise to progressively more complex molecules and eventually to living organisms
Which of the following definitions is INCORRECT?
A) endemic: a disease that is constantly present in a population B) epidemic: a disease that is endemic across the world C) pandemic: a disease that affects a large number of people in the world in a short time D) sporadic: a disease that affects a population occasionally E) incidence: number of new cases of a disease