List and explain the five steps involved in DNA replication.
What will be an ideal response?
1. The enzyme DNA helicase unwinds and unzips the DNA strand by breaking the hydrogen bonds between the base pairs.
2. New complementary DNA nucleotides are fit into place by the process of complementary base pairing. These are positioned and joined by the enzyme DNA polymerase.
3. DNA synthesis occurs in an antiparallel direction. The leading strand follows the helicase while the lagging strand results in short segments called Okazaki fragments.
4. The enzyme ligase seals any breaks or gaps in the DNA strand allowing DNA to return to its coiled state.
5. The result is two double-helix strands that are identical to each other.
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Following its initial activation, how does a G protein become inactivated?
A. It spontaneously loses activity within a few seconds. B. The G-protein ? subunit containing a GTP eventually reassociates with the G-protein ?? dimer. C. The G-protein ? subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein ? subunit and ?? dimer. D. The receptor becomes internalized. E. The G-protein ? subunit is digested and recycled.
What reproductive structure is used by ascomycetes during sexual reproduction?
a. Mycorrhiza b. Zygospore c. Flagellated sperm d. Basidiocarp e. Ascus
The potential energy that an inactive neuron maintains as a result of its polarized membrane is called the _________ potential.
Fill in the blank(s) with the appropriate word(s)
In the liver, the polysaccharide glycogen is broken down into glucose monomers. The glucose molecules are then released into the blood when blood sugar levels need to be raised. This process is an example of a(n) ________ reaction
A) kinetic B) potential C) exergonic D) endergonic