Who first identified nucleic acids, and where were they discovered?

erma4kov [3.2K]

Bacteria in our gut help to protect us by crowding out some of their dangerous relatives that can cause disease. Other good bacteria have been used in medicine to create antibiotics, and others still are used in food production to make fermented foods (think sauerkraut, yogurt, kimchi and kombucha.)

3 0

3 years ago

In stressful situations, the sympathetic nervous system ________ the arteries of the circulatory system and ________ the pupils

sukhopar [10]

The correct terms to fill in the blanks would be contracts and dilates. In stressful situations, the sympathetic nervous system contracts the arteries of the circulatory system resulting to the dilation of the pupils of the eyes. Also, during these situations, the blood sugar levels are raised since the hormones for stress kick in to combat the stress which in turn raises the blood sugar.

4 0

3 years ago

X has successfully been transmitted to your body; you are now infected. All of the following among A-D are possible consequences

Natasha2012 [34]

The complete options to the question includes:

A.You never show any symptoms of disease and there is no sign of the pathogen in your body.

B.You exhibit mild symptoms of disease and the levels of the pathogen in your body are quickly reduced and eliminated.

C.You succumb to the worst effects of the disease but survive due to administration of antimicrobial agents.

D.You never show any symptoms of disease, but the pathogen persists in your body.

E.There are no exceptions, A-D are all plausible outcomes.

Answer: The correct option is A (You never show any symptoms of disease and there is no sign of the pathogen in your body).

Explanation:

Infectious diseases occurs when an individuals system is invaded by pathogenic microorganisms (virus,bacteria,fungi and parasite). These microorganisms may or may not cause disease but this depends on the healthy state of the host. They can also be transmitted from one person to another.

To explain the options why all are plausible outcomes when X has successfully been transmitted into the body except A includes:

B) option B can occur when the immune system of the host is able to combat X.

C.) Option C can occur when antimicrobial is given to suppress the activities of X

D) option D can occur when the individual may become an asymptomatic carrier of X. ( Individual shows no symptoms and signs of disease caused by X but the pathogen is still present in the body).

But option A is not possible as X must be present to show there was a transmission.

6 0

3 years ago

2.4 State two reasons why the fern plants are able to

crimeas [40]

Answer:

Explanation:

This is because ferns are vascular plants i.e they have vascular tissues which are xylem and phloems which help to conduct water and nutrients while mosses are non vascular plants.

2. Ferns sporophytes are differentiated into true leaves, stems and true roots while mosses lack true roots, stems and leaves.

Underground stems are modified part of plants that are derived from stem tissues which grow under the ground. Underground stems grow beneath the soil. Examples include Rhizomes, ginger, tubers e t.c.

5 0

2 years ago

12. Removing an organism from an ecosystem will have which of the following affects? Select all that apply.

lutik1710 [3]

Answer:

B and D

Explanation:

Biodiversity comes from having multiple types of organisms. This also allows different organisms to eat and create nutrients that is needed by all other organisms in the ecosystem.

4 0

3 years ago