The surface area of the small intestine is dramatically increased due to the presence of _________ on the luminal surface.
A. villi and microvilli
B. lacteals
C. capillaries
D. hydrolytic enzymes
E. smooth muscle
A. villi and microvilli
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What may result when grafted tissue such as bone marrow contains passenger lymphocytes?
A. Graft versus host disease B. Formation of autoantibodies C. Hypogammaglobulinemia D. Host rejection of graft
The area labeled “B” is
a. a nucleus. b. nucleoplasm. c. endoplasmic reticulum. d. a vacuole. e. a nucleoid.
List and describe the five functions of the reproductive system.
What will be an ideal response?
For each of the following sentences, fill in the blanks with the best word or phrase in the list below. Not all words or phrases will be used; use each word or phrase only once
Most variation between individual humans is in the form of __________________. __________________ may arise by recombination within introns and can create proteins with novel combinations of domains. Scientists and government regulators must be very careful when introducing herbicide-resistant transgenic corn plants into the environment, because if resistant weeds arise from __________________ then the herbicides could become useless. Families of related genes can arise from a single ancestral copy by __________________ and subsequent __________________. divergence purifying selection exon shuffling single-nucleotide polymorphisms gene duplication synteny horizontal gene transfer unequal crossing-over Fill in the blank(s) with correct word