Question 1 of 10

Biology

2 answers:

diamong [38]3 years ago

4 0

Answer:

I think the answer to your question is D

Rudiy273 years ago

3 0

Answer: D. The land near rivers has fertile soil

Explanation: People needed to settle in areas in which it would be easier to live and farm. A river provided that needed support in order to do so. The river would also allow for there to be plenty of drinking water.

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If the shape of an enzyme's active site were to change, what would happen to the reaction that the enzyme usually conducts?

USPshnik [31]

It would change too because the reaction is based on the enzyme.

3 0

3 years ago

In this week's experiments, if you replaced glucose with the monosaccharide fructose, predict the results for fructose transport

lbvjy [14]

Answer: Fructose is transported by facilitated diffusion.

Explanation:

Glucose is a monosaccharide with the molecular formula C6H12O6.3 It is a hexose. It is a form of sugar that is found freely in fruits and in honey. Its energy yield is 3.75 Kcal/g under standard conditions.

Fructose is a type of carbohydrate found in vegetables, fruits, and honey. It is a monosaccharide with the same molecular formula as glucose, C6H12O6, but with a different structure, that is, it is an isomer of glucose. Its energetic power is the same as that of glucose, 4 kilocalories per gram, and it is a reducing carbohydrate.

Glucose is the main energy substance of a cell and for its entry it requires a transport protein in the cell membrane, called transporter. The transport of glucose through the cell membrane is carried out by two families of membrane proteins:

Sodium-coupled glucose transporters (SGLT sodium-glucose-transporters), which involves the co-transport of Na+ by the SGLT-1 by maintaining the Na+ gradient thanks to the Na+/K+ pump
Glucose transport facilitation proteins (GLUT)

On the other hand, fructose is absorbed by another type of transporter, called Glut-5, a protein that crosses the membrane 12 times. Finally, the passage of both glucose and fructose into the blood takes place through the Glut-2, a transporter with low affinity and high transport capacity.

If any Glut is considered within the context of a large family of proteins, it can be immediately noticed that they all possess common characteristics that in biochemical terms are called "molecular signature of glucose transporters" and that it is no more than a set of extremely conserved primary amino acidic sequences that determine secondary and tertiary structures (domains or motifs) that are responsible for the functional characteristics of the protein.

Facilitated diffusion is a type of cellular transport where the presence of a carrier or transporter (integral protein, Glut is this example) is necessary for substances to cross the membrane. It happens because the molecules are larger or insoluble in lipids and need to be transported with the help of membrane proteins. So, in the first step, fructose binds to the transport protein, and this changes shape, allowing the passage of this sugar. In this way, fructose concentrations inside the cell are always very low, and the external and internal concentration gradient favours diffusion.

Summarizing, fructose is transported by facilitated diffusion. So if we replaced glucose with fructose we would have seen no change in each conditions. And since fructose is transported by this type of mechanism, there is not a concentration gradient.

6 0

2 years ago

If a pea plant has a genotype SSTt what are the possible genetic combinations that could be present ina single grain of pollen p

Evgesh-ka [11]

Correct answer: D

A pollen is where male gametes are produced and so the number of chromosomes, as we are talking about gametes, is n. This means that the grain of pollen will only have a copy of each gene, and therefore only one allele for each gene - one S, and one T or t. So, the possible combinations are ST and St.

3 0

3 years ago

You are on the scene in the bad part of town for an unresponsive 18-year-old type 1 diabetic patient. his mother states that he

Margaret [11]

The answer would be: Continue patient care by getting a complete SAMPLE history and perform a complete secondary assessment.

If the reading of glucose test is normal, then you can exclude hypoglycemia from the possible diagnosis. Because the patient is accompanied by his mother, you can ask a brief history to exclude other possible diagnosis and complete secondary assessment before further help comes. The information would be beneficial to the healthcare personnel that will comes for help.

8 0

3 years ago

What type of medical direction do standing orders and protocols describe?

MrRa [10]

offline medical direction

It is also called "Indirect" medical direction.

It is issued by Med Director allowing EMTs to give particular medication and perform certain procedures without speaking to another physician. It is a type of medical oversight where control include emergency care improvements.

3 0

3 years ago