The liquid portion of the blood that consists of about 55% of the total volume of blood is referred to as ________
A) stem cells
B) leukocytes
C) plasma
D) platelets
C
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The environment can impact the phenotype controlled by polygenic inheritance
Indicate whether the statement is true or false.
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 nervous system development with all 302 of its neurons and their effectors categorized. Interesting control mechanisms have been investigated with reproduction, particularly with egg-laying in the nematode. 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 the 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
Which of the following chemical agents is used for sterilization?
A) alcohol B) phenolics C) ethylene oxide D) chlorine E) soap
What moves the food from your mouth to your stomach when you swallow?
A. Pressure difference between zones of the esophagus B. Gravity C. Enzymes excreted by the salivary glands D. Peristaltic muscle contractions