How is sex determined in most ants and bees?
A) by the X-Y system
B) by the Z-W system
C) by the number of chromosomes
D) by the size of the sex chromosome
Answer: C
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Which of the following is a difference between the solenoid and zigzag models for the formation of the 30 nm filament?
A. Most of the evidence to date supports the solenoid model, while the zigzag model is unlikely to occur in cells. B. Linker DNA is at the center of the filament in the zigzag model, and on the outside of the filament in the solenoid model. C. The solenoid model is a one-start helix and the zigzag model is a two-start helix. D. The helical pitch in the solenoid model is higher than the helical pitch in the zigzag model. E. The zigzag model occurs in higher eukaryotes such as humans, while the solenoid model occurs in lower eukaryotes such as yeast.
Water held behind a dam would best reflect ________.
A. potential energy B. kinetic energy C. chemical energy D. heat energy E. mechanical energy
Proteins that are loosely associated with the cytoplasmic membrane are called ________ proteins.
A. external B. internal C. peripheral D. integral
Which cells release antibodies into the plasma?
a. T helper cells b. plasma cells
c. cytotoxic T cells d. B cells e. antigen presenting cells