Which of the following is NOT true of cytoplasmic determinants?
A. They are asymmetrically distributed across the unfertilized egg
B. They are usually mRNAs or proteins
C. They originate from the embryonic genome
D. They are distributed unequally in different blastomeres as a result of cleavage
Ans: C. They originate from the embryonic genome
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Sperm find their way to the archegonium
a. by swimming. b. due to a chemical gradient diffusing from the archegonium. c. as a result of sucrose being released during the breakdown of the neck canal cells of the archegonium. d. by all of the above.
During an automobile accident, Susan received a serious head injury to the left side. Afterward she had a hard time speaking, although she showed that she understood what was being said to her. Which area of her cerebrum was damaged?
A) occipital lobe B) frontal lobe C) temporal lobe D) medulla oblongata
Your friend works in a biotech company that has just discovered a drug that seems to promote lamellipodia formation in cells. Which of the following molecules is unlikely to be involved in the pathway that this drug affects?
(a) Rac (b) ARP (c) actin (d) myosin