Data produced by C. Bridges in the early part of this century indicate that sex in Drosophila is determined by ________
A) the number of Y chromosomes
B) a balance between the number of X chromosomes and the number of haploid sets of autosomes
C) the SRY gene
D) the number of X chromosomes
E) the ratio of X to Y chromosomes
Answer: B
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The figure above represents analysis of blood from a victim of a crime and two suspects. Criminologists created this Southern blot using restriction fragments from a VNTR site. Which suspect is definitely guilty?
A. suspect 1 B. suspect 2 C. both D. neither
The area indicated by "A" in the figure
represents a. sunlight energy in the environment. b. heat energy in the environment. c. electrical energy in the environment. d. ionizing radiation in the environment. e. the explosion of the hydrogen gas to release energy for the reactions
Diploid cells of the fruit fly Drosophila have ten chromosomes. How many chromosomes does a Drosophila gamete have?
a. 1 b. 2 c. 5 d. 10 e. 20
Which of the following is a typical feature of an ATP-driven active transport mechanism?
A) The transport protein must cross to the correct side of the membrane before the solute can bind to it. B) The transport protein is irreversibly phosphorylated as transport takes place. C) The transport protein catalyzes the conversion of ADP to ATP. D) The solute moves against the concentration gradient.