Why were the first RNA replication experiments insufficient support for the RNA world hypothesis?
a. The experiments did not demonstrate natural selection.
b. RNA could not adapt to environmental challenges.
c. The RNA produced was not self-replicating.
d. No mutations occurred in the RNA.
e. Mutations occurred but they were not heritable.
C
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What is true of the differences between chemical and electrical synapses?
a. Signals across chemical synapses are sometimes bidirectional. b. Electrical synapses are only found in the brain. c. Neurons are physically connected across electrical synapses. d. Only charged ions can travel across electrical synapses.
What are the vasa recta?
a. looped extensions of the afferent arterioles b. looped extensions of the efferent arterioles c. regions of the renal tubule d. vessels that supply blood to the glomerulus e. vessels that supply blood to the proximal convoluted tubule
Echinoderms are characterized by bilateral symmetry in adults, a water vascular system, tube feet, and spiny skin. Indicate whether the statement is true or false
How many chromosomes are in a human gamete?
A) 23 B) 46 C) 26 D) 42 E) 43