Which type of junction involves a connection to the actin cytoskeleton?
(a) adherens junctions
(b) desmosomes
(c) tight junctions
(d) gap junctions
(a)
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Assume that an mRNA transcript is synthesized complementary to this DNA sequence:3
'-CTTACATGGCATCC-5' See the provided genetic code table. If the start codon is considered the first codon, which amino acid is specified by the second codon?
a. asparagine b. tyrosine c. arginine d. proline e. cysteine
In the cells of a female mammal, ________ is(are) inactivated
a. either the maternal or paternal X chromosome b. all maternal X chromosomes c. all paternal X chromosomes d. both the maternal and paternal X chromosomes
Grasslands most often are found _____
a. at 30ยบ north and south b. at high altitudes c. in interior of continents d. all of these
Which of the following statements is NOT
TRUE concerning an electron that has absorbed a photon? a. It moves to a higher energy level. b. It becomes more stable. c. It quickly returns to its original energy level. d. It may emit energy. e. It becomes excited