Which type of cellular junction allows for the movement of proteins and transfer RNA molecules?
A. desmosomes
B. plasmodesmata
C. gap junctions
D. Answers b and c are both correct.
B
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________ produces the second messenger diacylglycerol (DAG).
Fill in the blank(s) with the appropriate word(s).
Transfer RNA differs from other types of RNA because it
a. transfers genetic instructions from cell nucleus to cytoplasm. b. specifies the amino acid sequence of a particular protein. c. carries an amino acid at one end. d. contains codons. e. has different bases in its nucleotides.
Of the earth's land, what is the maximum percentage now being used for agriculture?
a. 10 b. 15 c. 25 d. 50 e. 75
In the Meselson and Stahl (1958 ) experiment, bean plants (Vicia faba) were radioactively labeled so that autoradiographs could be made of chromosomes
Indicate whether the statement is true or false