Answer:
B
Explanation:
Helicase is the enzyme that unwinds the DNA by breaking hydrogen bonds between the two strands. It forms the so called replication fork.
Explanation:
the allele for unattached earlobes is dominant over the allele for attached earlobes. In a population if “500 individuals”, 25 percent show the recessive phenotype. How many individuals would you expect to be heterozygous for this trait?
possible answers:
• 75
•125
•200
•25
<span>The communication in which molecules move from one place to another inside of a cell is intracellular type of communication, molecular signal. Answer:B
The molecular signals can be one of the following four types:
</span>Endocrine, Paracrine, Neuronal and Juxtacrine.
Answer:
e) all of the above are methods of hormone action
Explanation:
Hormones are the chemicals that are secreted by endocrine glands mostly. They serve to regulate physiological processes. Most of the lipid-soluble hormones such as steroid hormones enter the target cell to bind to their cytosolic or nuclear receptors and alter the expression of genes. These hormones stimulate the expression of some genes and inhibit that of others.
Binding of hormones to the cell surface receptors associated with ion channels regulates their opening and closing and thereby affects the membrane permeability. Likewise, the active hormone receptor complexes regulate the electrical signaling pathways of muscles and neurons.
Answer:
Diffusion
Explanation:
Diffusion is the process whereby molecules move from an area of high to low concentration
