Describe the functions of the four layers of the digestive tract (mucosa, submucosa, muscularis, and serosa) and indicate how they work together to acquire and distribute nutrients
What will be an ideal response?
Mucosa: Epithelia lines the lumen, contains glands that produce enzymes, mucus, and hormones. Submucosa: Connective tissue with blood and lymph vessels that pick up digested food. Muscularis: Smooth muscle with longitudinal and circular muscles that undergoes peristaltic contraction. Serosa: Surrounds muscles and joins with mesenteries to suspend the gut in the body cavity. Because the gut is suspended, the muscles can move different parts of the gut independently. This mixes the food with the secretion of the mucosa and facilitates transport on nutrients into the submucosa.
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In cows, certain coat colors are co-dominant
For example red is dominant; white is recessive; roan (red and white) is co-dominant. If a roan bull is crossed with a white cow what will be the expected coat colors of the calves?
a. all roan b. half roan and half white c. half red and half white d. 3/4 roan and 1/4 white e. 1/2 roan, 1/4 red, 1/4 white
A ________ diagram plots each species in a community, beginning with the most abundant and ending with the least abundant, along the x-axis, with the corresponding value of relative abundance on the y-axis
Fill in the blank(s) with correct word
What is the difference between an electrically neutral atom and an ion?
a. An ion has an unequal number of protons and electrons, while a neutral atom has an equal number. b. An ion has an equal number of protons and electrons, while an atom has an unequal number. c. An atom has an unequal number of neutrons and protons, while an ion has an equal number. d. An atom has its electrons in orbitals, while an ion has its electrons in its nucleus. e. An atom must have an equal number of neutrons and electrons, while an ion does not.
A serum sample from a patient is examined on an electron microscope, and observed to contain Dane particles, filamentous, and spherical virion particles in abundance. This observation indicates infection with
A. human herpesvirus 1. B. EBV. C. hepatitis B. D. hepatitis D. E. VZV.