Answer:
D
Explanation:
Additional classes of steroids include:
Neurosteroids such as DHEA and allopregnanolone
Aminosteroid neuromuscular blocking agents such as pancuronium bromide
The right answer is A.) DNA in mitochondria
.
Eukaryotic cells, with their many intracellular organelles, have long been considered progeny of prokaryotes that would have become more complex as a result of genetic mutations. But from the 1960s, biologist Lynn Margulis proposed an alternative explanation that was first received coldly by the scientific community. His endosymbiotic theory, proposed in a more formal way in a 1981 book, proposes that eukaryotic cells as we know them today would be the result of a series of symbiotic associations with different prokaryotes.
Mitochondria and chloroplasts also have their own DNA that is not trapped in a nucleus, which is also the case with prokaryotes. However, the proteins encoded by this DNA do not cover all mitochondrial proteins. The prokaryote is thought to have lost some genes to the nucleus of the cell, a process known as "endosymbiotic gene transfer". For this reason, mitochondria and chloroplasts are now host-dependent for the synthesis of most of their components.
Answer:
80%
Explanation:
Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. Seeds can only be produced when pollen is transferred between flowers of the same species.
Honeybees pollinate 80 percent of U.S grown crops—products valued at more than $14 billion. Crops that benefit from honeybee pollination include fruits, nuts, vegetables, cotton and other small grains. They also include cover crops, which farmers plant between commercial crops to prevent nutrient runoff and soil erosion and boost soil nutrients.
It’s estimated that there are about 2.4 million honeybee colonies in the U.S. today.
In a single day, one honeybee makes 12 or more trips from its hive, visiting several thousand flowers at a time. On each trip, it confines its visit to one plant species, collecting one kind of pollen. This enables the colony to find and collect food with maximum efficiency, which makes honeybees the most valuable pollinators.