Who is responsible for keeping the public safe from toxic wastes and polluted water and air?

What role does evolution play in the emergence of antibiotic resistance in bacteria?

tiny-mole [99]

1.Antibiotic resistance is a consequence of evolution via natural selection. The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this trait to their offspring, which will be a fully resistant generation.

2. Bacteria evolve quickly because they grow fast and can share genes. Helpful mutations spread quickly in bacteria.

3.Taking antibiotics too often or for the wrong reasons can change bacteria so much that antibiotics don't work against them. This is called bacterial resistance or antibiotic resistance

4. Antibiotic resistance leads to higher medical costs, prolonged hospital stays, and increased mortality. The world urgently needs to change the way it prescribes and uses antibiotics.

I think so

7 0

3 years ago

What type of cell is the precursor to the helper t cell?

sineoko [7]

I am pretty sure it is CD4 cell

3 0

3 years ago

What second messenger most directly causes calcium ions to be released from intracellular stores?

NemiM [27]

Answer: adenylyl cyclase inositol triphosphate mainly known as IP3 causes the release of Calcium ions directly from the inracellular stores and causea contraction.

Explanation:

IP3, inositol phosphate is a second messenger a signaling molecule. It is made by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid that is located in the plasma membrane, by an enzyme phospholipase C.

IP3 binds to the calcium channels and opens Ca2+ channels that are embedded in the ER membrane, releasing Ca2+ into the cytosol. Calcium ions released may cause contraction and regulate the Ca2+ channels in the membranes.

6 0

3 years ago

Which of the following is UNLIKELY to affect bone remodeling?

S_A_V [24]

Glucagon

This is a hormone that deals with blood sugar homeostasis. When blood sugar levels are low, glucagon is produced to convert the fats in the reserve back to glucose until normal levels are achieved.

Explanation:

Bone remodeling involves coordinations of osteoclasts and osteoblasts cells in the bone. The former breaks down bone tissue while the latter mineralizes bones. Calcium is the main ion in the body significant in mineralization of bone. Excess Ca2+ is stored in bone while low calcium levels in blood result in bone resorption.

Stress on a bone also causes increased mineralization to strengthen the bone against this stress. This is why astronauts when they go to space, due to less stress from low gravity, bone loses its mass. When they return back to earth, the bone readjusts to the increased stress from higher gravity by increased mineralization.

The hormone responsible for bone homeostasis is parathyroid hormone.

Learn More:

To learn more about bones check out; brainly.com/question/4128260

#LearnWithBrainly

3 0

3 years ago

_____ is a type of amphetamine that can be easily manufactured, provides an intense high, and causes a reduction in the brain's

Elina [12.6K]

Methamphetamine

Methamphetamine is also called crystal meth. It can be in the form of a pill or as a white, bitter-tasting crystalline powder. It is a central nervous system stimulant. It is potent and highly addictive. It causes euphoric effects

3 0

3 years ago