Answer:
B - Some organic molecules, including amino acids, could have been produced from chemical reactions on early Earth
Explanation:
The Miller-Urey experiment was a chemical experiment that attempted to recreate the chemical conditions present on early earth, and used these conditions to try to decipher how life on earth came about.
Their experiment showed that simple organic compounds (i.e. amino acids) that represent the building blocks of complex macromolecules (i.e. proteins) could be formed from this experimental set up with the addition of energy. This showed the minimal features required to form life.
Proximal convoluted tubule cells. As well as the epithelial cells along the renal tubule and the duct. Hope this helps!:)
Answer:
D
Explanation:
Both BB and Bb will result in brown eyes as it is the dominant trait. Only bb will result in blue eyes thus the answer is both choice 1 and 2.
Answer:
Nearly 50%
Explanation:
The earth about 8000 years back was comprised of almost 6 billion hectares of forest-covered land. And according to the research, it has been observed that nearly 50% of the initially forest-covered region has been reduced, which has now become about 3 billion hectares.
These forests are being cut down for various purposes, such as construction of urban areas, construction of wooden houses, making furniture, overgrazing of animals, forest fire. It causes both naturally as well as due to anthropogenic activities.
Thus, nearly 50% of the forest is reduced in the last 8000 years.
Answer:
The lytic cycle.
Explanation:
<u>HIV is a retrovirus</u> that has a special enzyme called transcriptase reverse, which can synthesize DNA using RNA as a template. This replication system is particularly useful for the virus because the DNA synthesized from the RNA viral genome can be then integrated into the human chromosomes and stay inactive for years. This is called a lysogenic cycle and is characterized by a latency of the virus and an integration to the host DNA.
When there is a triggering event, <u>this latent virus can be excised from the human chromosome and start producing copies of itself using the host machinery.</u> <u>Then the virions are assembled and after that they lyse the host cell and release new infective units that can then infect neighboring cells. </u>This is called the lytic cycle of the virus and is the reproduction cycle that occurs when a person moves into the acquired immunodeficiency syndrome (AIDS) stage of HIV infection.