During the first four days of development following fertilization, cells of the embryo undergo rapid cleavage, but the size of the embryo remains the same
Indicate whether the statement is true or false
TRUE
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Explain how the basic structure of a phospholipid bilayer is maintained in an aqueous solution, and identify a change you can make that would permanently disrupt the bilayer
What will be an ideal response?
The last common ancestor of fungi, mammals, and archaea likely had which of the following characteristics?
A. both a plasma membrane and a circular chromosome B. both a circular chromosome and membrane-bound organelles C. both free-floating genetic material (DNA) and a distinct nucleus D. both membrane-bound organelles and a circular chromosome E. both a distinct nucleus and a plasma membrane
Which type of junctions involves closable channels that connect the cytoplasm of adjoining animal cells?
a. gap junctions b. plasmodesmata c. tight junctions d. adhering junctions e. blocking proteins
Which of the following is incorrect about transfer RNA?
A. The initiator tRNA that binds to the P site has the anticodon UAC. B. has a bottom hairpin loop with an anticodon C. contains a binding site for an amino acid D. An anticodon is complementary to a codon. E. Initiator tRNA in bacteria carries tryptophan.