A protein that speeds up chemical reactions without being consumed in the process is called a(n) ________
Fill in the blank(s) with correct word
enzyme
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Before gastrulation, the future destiny of cell lineages is largely established by ____
a. the genotype b. the portion of egg cytoplasm c. surface recognition factors on the plasma membrane d. the number and type of organelles e. the sperm cytoplasm
Which statement is true?
1.The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. 2.Adenine always pairs up with guanine in DNA, and cytosine always teams up with thymine. 3.Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. 4.When adenine base pairs with thymine, they are linked by three hydrogen bonds. 5.In the DNA of all species, the amount of cytosine never equals the amount of guanine.
Which of the following tests does NOT provide information on the lowest concentration of drug effective on a pathogen?
A) Etest B) diffusion susceptibility test C) broth dilution test D) both the Etest and diffusion susceptibility test E) MBC test
The breeding of plants and animals for particular traits by humans is called _______.
A. natural selection B. paleontology C. sexual recombination D. homology E. artificial selection