Biology Questions

Allows for expansion or contraction of the trachea. Hence, so large masses of food can pass through the esophagus during swallowing.

The principal hormone secreted by the corpus luteum is progesterone. Menstruation is triggered by a drop in the levels of progesterone.

At the synapse between two neurons, electrical signals are converted into chemical signals. A synapse is the gap between the two neurons.

The statements true about viruses are :

1. The capsid enters the host cell if the virus is enveloped.

2. Enveloped viruses bud from the host cell. 

3. HIV contains reverse transcriptase.

4. A retrovirus contains RNA.

The principle of dominance states that some alleles are dominant, while others are recessive.

Receptors for hearing the organ of corti or the spiral organ is located in the the mammalian cochlea.

Chloroplasts contains chlorophyll, the green substance in plants that allows them to create food from carbon dioxide and water called as photosynthesis.

Ribosomes are present in prokaryotic cells. These are organelles which consist of two subunits. They are present in both Eukaryotic and Prokaryotic cells. They are made up of RNA and proteins and present in the cytoplasm and on the membranes and are involved in protein synthesis.