The enzymes used to cut genes in recombinant DNA research are called
A) replicases.
B) restriction enzymes.
C) spliceosomes.
D) RNA polymerases.
E) DNA polymerases.
B
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Answer the following statements true (T) or false (F)
1. Sodium and potassium ions can easily diffuse through the lipid bilayer of plasma membranes. 2. Transport of salts against their concentration gradients is energetically expensive. 3. If you measured the urine concentration of a freshwater fish, you would find that it was more concentrated than its blood. 4. If you measured the urine concentration of a saltwater fish, you would find that it was more concentrated than its blood. 5. Sweat has a higher salt concentration than the blood does in humans.
Binding of a protein hormone may lead to formation
of a __________, which relays a signal into the cell. Fill in the blank(s) with the appropriate word(s).
Which lists the stem cells from the least to the highest degree of flexibility?
A) embryonic stem cells < adult stem cells < zygote B) embryonic stem cells < zygote < adult stem cells C) adult stem cells < zygote < embryonic stem cells D) adult stem cells < embryonic stem cells < zygote
A structure that appears in a transmission electron micrograph but is not actually present in the specimen is known as a(n)
A) antigen. B) biofilm. C) artifact. D) refraction. E) mordant.