Who was the first person acknowledged to have seen living, moving cells by using a microscope?
A. Robert Hooke
B. Robert Brown
C. Galileo Galilee
D. Rudolf Virchow
E. Anton van Leeuwenhoek
Answer: E
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A digestive cavity in which food enters an opening at one end and passes through the animal in one direction as it is digested is called the
A. gastrovascular cavity. B. stomach. C. alimentary canal. D. epithelial cavity. E. intestine.
During radioactive decay, the nucleus of an atom ________
a. disintegrates, releasing particles and energy b. captures an unclaimed proton c. transposes its neutrons and electrons d. converts from a relatively stable to an unstable form
Each nucleus in a human somatic cell contains ________ chromosomes
Fill in the blank(s) with correct word
Suppose that the first part of a new polypeptide chain being produced in a eukaryotic cell has a signal peptide. Where would this polypeptide be located within the cell as it is maturing?
a. first in the rough ER, and then in the Golgi apparatus b. first in the cytoplasm, and then in the rough ER c. in the cytoplasm only d. in the Golgi apparatus only