What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract
A
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Most plant viruses have genomes made of:
A. single-stranded DNA. B. double-stranded DNA. C. proteins. D. single-stranded RNA. E. double-stranded RNA.
In plants, peroxisomes associated with nitrogen fixation in legumes can be found in great abundance in
A) leaves. B) stems. C) phloem and xylem. D) cotyledons. E) root nodules.
The presence of circular DNA in mitochondria and chloroplasts suggests that these organelles evolved from ____
a. bacteria b. nuclei c. single celled eukaryotes d. anaerobic microorganisms e. archaea
In genetic analyses, researchers know that linkage of genes will introduce exceptions to the
principle of a. dominance. b. segregation. c. recessiveness. d. independent assortment. e. chromosomal inheritance.