In a testcross an individual of unknown genotype is crossed with ___________.
a. a homozygous dominant individual
b. a homozygous recessive individual
c. a heterozygous individual
d. an individual lacking the gene
Answer: b. a homozygous recessive individual
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Which of the following does not describe an instance in which weak chemical bonds are useful in biological systems?
A. the bonding of antibodies to the antigens they recognize B. the folding of proteins into their active conformation C. the stabilization of DNA double-stranded helices D. the stabilization of protein structure by the creation of salt bridges between oppositely charged amino acids E. a gecko's ability to climb surfaces such as glass
________ is a macromolecule containing alternating N-acetylglucosamine and N-acetylmuramic acid cross-linked by short peptide fragments.
Fill in the blank(s) with the appropriate word(s).
The three shapes of bacteria are
What will be an ideal response?
For which of the following questions would you use the sum law?
A) determining the chance of pulling an ace from a deck of cards B) determining the change of rolling a 5 on a ten-sided die C) determining the chance of having a tall plant with purple flowers D) determining the chance of having a baby girl E) determining the chance of pulling either a club or a heart from a deck of cards