Which of the following would be correctly described as a juxtacrine signaling?
A) a signal that requires physical contact between cell
B) a signal that acts on the cell that produces it
C) a signal that diffuses over long distances from the producing cell
D) a signal that diffuses over short distances from the producing cell
E) a hormonal signal
Answer: A
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Linked genes are ____
a. genes whose effects combine to influence a single characteristic b. different alleles of the same gene c. genes that affect two different traits and lead to a 9:3:3:1 phenotype ratio in a dihybrid cross d. genes that do not sort independently because they are physically near each other on the same chromosome e. genes on two different chromosomes
In a freshwater pond, a green alga is likely to be
A) colonial. B) filamentous. C) unicellular. D) colonial, filamentous, multicellular, or unicellular.
DNA wraps around histone proteins to form repeating units called ____
What's the answer to this statement?
Which structure becomes part of the placenta?
a. chorion b. amnion c. blastocoel d. yolk sac e. allantois