Chromosomes of a pair of homologous chromosomes
may differ from other chromosomes in terms of
a. size.
b. shape.
c. the alleles they carry.
d. the position of the centromere.
e. all of these.
Answer: e
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Which of the following statements are true regarding bacteria in the human body? Select all correct choices
A. Human bodies can contain pathogenic bacteria, but these are often kept in check by other (non-pathogenic) species. B. Human bodies can actually contain bacteria that are beneficial to certain processes (e.g., digestion). C. The TB-causing bacteria M. tuberculosis is present (but dormant) in many human bodies.
What kind of bonds hold the two strands of the DNA molecule together?
a. glycosidic b. phosphodiester c. hydrogen d. tetravalent
Which of the following indicates when the tree was likely suffering drought stress?
1.The close location of two cycles of early wood shown in A.
2.The lack of xylem vessels in C.
3.The large vessels in the xylem shown in B.
4.The two series of xylem vessels close together shown in D.
Through chemical digestion, polysaccharides are broken down into
A) fatty acids. B) monosaccharides. C) nucleotides. D) amino acids.