Marc Spehr and his colleagues demonstrated which of the following?
a. Sperm cannot detect and swim toward attractant molecules.
b. Sperm attraction can be stimulated by chemicals.
c. Eggs release chemicals that attract sperm.
d. Sperm can detect and swim toward attractant molecules, and sperm attraction can be
inhibited by chemicals.
e. Sperm can release chemicals that kill other sperm
D
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Archaea have a unique form of conjugation involving cytoplasmic bridges for bidirectional transfer of DNA
Indicate whether the statement is true or false.
Which of the following distinguishes terrestrial biomes from one another?
a. Plant diversity b. Precipitation c. Mountain ranges d. Animal diversity
Stratified epithelium is typically used for
a. protection. b. secretion. c. absorption. d. excretion. e. reproduction.
In mammals, blood returning from the head will pass through the ________ just before entering the right atrium
A) left atrium B) superior vena cava C) inferior vena cava D) aorta