Emergence of infectious disease can be due to all of the following reasons. Which one can be affected by changing human behavior?
A) mutations in microbes
B) earthquakes
C) lack of vaccination
D) floods
Ans: C) lack of vaccination
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Genetic evidence has revealed that H. sapiens diverged from _____________________ 100,000 years ago, while
Neanderthals diverged from this species 300,000 years ago, suggesting that modern humans did not descend directly from Neanderthals. Fill in the blank(s) with the appropriate word(s).
Which nitrogenous base percentage is complementary to the 22% guanine found in a double-stranded DNA molecule?
A) 22% thymine B) 22% cytosine C) 44% adenine D) 48% thymine
The ________ are a group within the Euglenozoa that have a unique, single mitochondrion.
Fill in the blank(s) with the appropriate word(s).
C.elegans is a model organism and was the first eukaryotic organism to have its genome sequenced. The free-living nematode is often used in laboratories investigating reproduction, particularly egg-laying
There are 16 muscles, 2 types of neurons, and multiple receptors involved in the process of laying eggs in C.elegans, and there are mutations in all of those structures for the study of the process. One particular mutation that prevents the laying of eggs by the worm is rescued by the neurotransmitter, serotonin. That rescue suggests that this mutation is most likely in which of the following? A) a post-synaptic neuron involved in egg-laying B) a pre-synaptic neuron involved in egg-laying C) a receptor for serotonin on cells needed for egg-laying D) one of the muscles needed for egg-laying