The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.
Answer the following statement true (T) or false (F)
False
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Genes located along the X chromosome:
A. have a full set of complementary alleles on the Y chromosome. B. are called X-linked genes. C. are contributed solely by the female parent. D. are always recessive to genes located on the Y chromosome.
The growth of P. acnes within hair follicles, in many individuals, leads to
A. eczema. B. carbuncles. C. boils. D. acne.
Bacteriophages may reproduce using a __________ pathway in which viral DNA becomes part of the
host chromosome. Fill in the blank(s) with the appropriate word(s).
Which of the following has not been shown to slow down the signs of aging in humans?
A) eating a very low-calorie diet B) regular exercise C) protecting the skin from sun exposure D) All have been found to be beneficial to humans.