Which of the following statements is true?
a. The hydrogen bonding of cytosine to
guanine is an example of complementary
base pairing.
b. In DNA, adenine always base pairs with
guanine, and cytosine always base pairs
with thymine.
c. Each of the four nucleotides in a DNA
molecule has the same nitrogen-containing
base.
d. When adenine base pairs with thymine,
they are linked by three hydrogen bonds.
e. None of these statements are true
A
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What is the relationship between recombination frequency and the actual physical distance on a chromosome?
A. As physical distance increases, the recombination frequency increases in a linear fashion. B. As physical distance increases, the recombination frequency decreases in a linear fashion. C. As physical distance increases, the recombination frequency first increases in a linear fashion, but gradually levels off to a frequency of 0.5. D. As physical distance increases, the recombination frequency first increases, but then decreases.
An __________ consists of hardened parts at the
body surface. Fill in the blank(s) with the appropriate word(s).
If a small region of a chromosome containing a non-essential gene is completely deleted, and an organism has two identical chromosomes with this deletion, then the organism
A) has no alleles of that gene. B) is dead. C) has more heterochromatin. D) has recessive alleles of those genes. E) will exhibit pseudodominance.
Explain how the composition of breast milk compared with formula affects the microbiota of infants.
What will be an ideal response?