Answer:
Internal and external regulators are two types of proteins that regulate the cell cycle. Internal regulators allow the cell cycle to proceed only after certain events occur. External regulators speed up or slow down the cell cycle.
Explanation:
I hope this helps :)
Answer:
Option C, varicella-zoster virus
Explanation:
The synonym for varicella-zoster virus is VZV and it is responsible for causing chicken pox in primary infection and shingles after the reactivation of latent VZV infection
It is a DNA virus that belong to the group of herpesvirus. All herpesviruses have the capability to persists in the body after primary infection as latent infection. These viruses survive for a short duration in the environment.
Hence, option C is correct.
Answer:
The plate that contains Kanamycin in it will have growth of colonies of bacteria that have been transformed with the plasmid which has the kanamycin-resistant gene. The bacterial cells that did not get transformed with this plasmid will not be able to grow into colonies in the presence of kanamycin.
While the negative control, a plate with any other antibiotic,such as ampicillin or tetracyclin, added to it will not allow growth of any bacteria on it.
Hope that answers the question, have a great day!
Answer:
<em>The correct option is A) an increase in oxygen levels, which led to the extinction of many anaerobic organisms.</em>
Explanation:
Photosynthesis can be described as a process in which food (glucose) is produced by photosynthetic organisms by using carbon dioxide, water along with light energy from the sun. Oxygen is released as a by-product of this reaction. The process of photosynthesis initially allowed for oxygen gas to get accumulated in the air. This caused the rise of aerobic organisms who required oxygen for respiration. Before the photosynthesis organisms evolved, there was not enough oxygen gas on earth to support the life of aerobic organisms.
