Defects in cell signaling can lead to a cancerous cell due to:
A. overproduction of signals that trigger cell
division.
B. overproduction of a receptor that triggers
cell division.
C. a defective receptor that stays in the
activated state and triggers cell division
continuously.
D. a defective signal-transduction protein that
stays in the activated state and triggers cell
division continuously.
E. All of these choices are correct.
E
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The volume of blood pumped out of a ventricle with each heartbeat is known as ________.
a) pressure (BP) b) heart rate (HR) c) cardiac output (CO) d) stroke volume (SV)
What is the main difference between a virulent bacteriophage and a temperate bacteriophage?
What will be an ideal response?
Which event occurs during the elongation stage?
a. Peptide bonds form. b. Free amino acids bind to the mRNA binding site. c. Anticodons bind to complementary codons.
d. A stop codon enters the ribosome. e. Peptide bonds form, and anticodons bind to complementary codons.
You take a 1-mL sample of pond water and add it to a colorless, viscous media in a small petri dish. When you place it under your dissecting microscope, you see three organisms. Two are struggling to move efficiently through the media, while the third
moves more quickly. You attribute the faster movement to the third organism's A) thick cell wall. B) flagella. C) fimbriae. D) chloroplasts.