Genetic modification of immune cells has not been shown to be an effective leukemia treatment
a. True
b. False
Indicate whether the statement is true or false
False
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Were there any eukaryotic cells on Earth 1.5 billion years ago?
A. No, they do not appear in the fossil record until around 1 million years ago. B. Yes, they first appear in the fossil record around 1.8 billion years ago. C. No, they do not appear in the fossil record until around 500 million years ago. D. Yes, they first appear in the fossil record around 3.5 billion years ago.
Which of the following is false concerning smooth
muscle cells? They a. do not have sarcomeres. b. contain a single nucleus. c. contain actin and myosin filaments. d. can sustain contractions longer than can striated muscle cells. e. have contractile units arranged in an orderly repeating fashion.
Organelles used to in cell division are the
a. cilia. b. flagella. c. centrioles. d. microfilaments. e. Golgi bodies.
Assuming that the rate of sea-floor spreading was constant during the one-million-year period depicted above, on average Earth's magnetic field has undergone reversal once every _____
A) 25,000 years B) 100,000 years C) 250,000 years D) 1,000,000 years