Which of the following is most likely to have a small protein called ubiquitin attached to it?
A) a cyclin protein, that usually acts in G1, in a cell that is in G2
B) a cell surface protein that requires transport from the ER
C) an mRNA leaving the nucleus to be translated
D) a regulatory protein that requires sugar residues to function properly
E) an mRNA produced by an egg cell that will be retained until after fertilization
Answer: A
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Arrow “B” points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in adult vertebrates by the vertebral column. e. includes all of these.
The vitreous body is located between the cornea and the lens
____________________ Indicate whether the statement is true or false.
The synthesis of protein or carbohydrate polymers always produces which of the following as a byproduct?
a. ATP b. Oxygen c. Carbon dioxide d. Urea e. Water
Which of the following conclusions is best supported by the results of the experiment?
(A) Neither population grows as large when cultured together as each does when cultured separately. (B) P. caudatum prefers different food when cultured with P. aurelia than when cultured separately. (C) Competition for mates increases when the species are cultured together compared with when they are cultured separately. (D) Individuals of the species P. caudatum are smaller when cultured together with P. aurelia than when cultured separately.