Which molecule is a common second messenger?
a. cGTP
b. cATP
c. PIP2
d. diacylglycerol
e. Ras
ANSWER: d
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A large region of the F plasmid (~33 kb) is called the transfer region (tra) and contains about 40 genes necessary for conjugation. The gene traA codes for the protein pilin that is polymerized to form a pilus, using a number of other tra genes
The pilus is a hollow cylinder whose units disassemble once contact is made in order to "reel in" the recipient cell. What other functions of the tra genes are required for transfer? A) DNA unwinding, and prevention of contact with F+ cells B) enzymatic DNA replication C) resistance to phage infection D) integration of F genes into the recipient's chromosome E) integration of F genes into the recipient's plasmid
The large intercellular spaces, which are common features of the root cortex, provide:a
a pathway for water uptake. b. aeration of the root. c. structural support. d. protection. e. Both aeration and a pathway for water uptake
Which of these hormones stimulates the production of milk?
A) Oxytocin B) Prolactin C) Estrogen D) Progesterone E) Colostrum
The F1 generation of the cross purple (PP) x while (pp) flower pea plants should _________.
a. all have white flowers b. all have a light purple or blended appearance c. all have purple flowers d. have 3/4 purple flowers and 1/4 white flowers