Answer:
1. sperm cell
2.testicles
3.egg
4.ovary
5.fertilization
6.fertilized egg = foetus
Explanation:
Operons are the functional units of transcription and genetic regulation. These are found in bacteria and their viruses where genes coding for functionally related proteins are grouped along the DNA.
The two types of operons are- inducible and repressible.
They regulate the genes as in negative inducible operons, a regulatory repressor protein is bound to the operator. It prevents the transcription of the genes on the operon. If positive inducer is present, it binds to the repressor and changes its conformation so it is unable to bind to the operator.
Answer:
C) They have similar antibiotic sensitivities to those of bacteria.
Explanation:
- Ribosomes are the site for biological protein synthesis that is composed of macromolecular machine for protein synthesis.
- In archaea they ribosomes comprise of three RNA molecules - 16S, 23S, and 5S.
- The archaeal ribosome is a 70S ribosome that is composed of 50S and 30 S subunits.
- The ribosomal binding site of archaeol ribosome may be similar to that of the bacteria, i.e. the Shine- Dalgarno sequence.
- <em>However, the antibiotic sensitivity of the archaeal ribosome is different than those of bacteria as the r-protein sequence of the archaea are closer to that of eukaryote than the bacteria. </em>
The correct answer is D. Porifera
Explanation
Porifera or sponges is a phylum that includes all simple primitive aquatic animals, distinguished by having a body full of channels and pores through which water flows. Sponges are formed by sets of cells that arrange in spicules which provide sponges a structure and spongin which is a protein. Additionally, sponges lack organs and are asymmetrical which means they have an irregular shape. Moreover, they stand out for having a great diversity of color and their sizes are varied from a few millimeters to more than 2 m high. So, the correct answer is D. Porifera.
Spleen
The spleen is located under the diaphragm and behind the stomach. It can get enlarged during an infection.
Explanation:
The spleen is a large lymph organ. It is highly vascularized and contains a meshwork that sieves out old and misshaped erythrocytes. It acts as a quality control measure for red blood cells. The organs has macrophages that engulf and digest the red blood cells that fail quality control and foreign matter. The spleen stores the iron the cell as bilirubin and is recycled yo make new blood cells in the red bone marrow.
The spleen also stores red blood cells hence your spleen helps you recover blood cells (and maintain the right blood pressure) when you lose a considerable amount of blood from a deep cut.
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