BIOLOGY HIGH SCHOOL

How many molecules of O2 can a single hemoglobin molecule carry when fully saturated?1. 16
2. 1
3. 4
4. 2
5. 8

Answers

Answer 1
Answer: 3. up to four molecules
Answer 2
Answer:

Final answer:

When completely saturated, one hemoglobin molecule can carry up to 4 molecules of oxygen.

Explanation:

When fully saturated, a single hemoglobin molecule can carry four molecules of Oxygen (O2). Hemoglobin is found in red blood cells and is the protein structure that is responsible for the transportation of oxygen from the lungs to the body's tissues. This is possible because each of the four polypeptide chains that make up the structure of hemoglobin has one heme group, and each heme group has one iron atom that can bind with one oxygen molecule. Hence, a single hemoglobin molecule can carry up to four molecules of oxygen.

Learn more about Hemoglobin here:

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After an RNA molecule is transcribed from a eukaryotic gene, what is removed and what is spliced together to produce an mRNA molecule with a continuous coding sequence?a) operators; promoters. b) exons; introns. c) silencers; enhancers.d) introns; exons. e) promoters; operators.

Which describes a grizzly bear’s habitat? all the biotic factors in the ecosystem all the abiotic factors in the ecosystem the role of the bear in the ecosystem the physical area where the bear lives

Answers

A grizzly bear’s habitat comprises of the physical area where the bear lives

What is a habitat?

A habitat is defined as the dwelling home of living organisms.

There are three major types of habitat; namely:

  1. Terrestrial habitat
  2. Aquatic habitat
  3. Arboreal habitat

  • Terrestrial habitat is the land habitat
  • Aquatic habitat is the water habitat
  • Arboreal habitat is the tree habitat

Learn more about habitat:

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An important aspect of safety when weight training and lifting heavy weight is
Please help

Answers

Don't hyperventilate (breathe in and out fast) or hold your breath when you lift heavy weights. You may faint and lose control of the weights. ... Don't lift heavy weights without spotters. Don't lift more than you know you can lift safely.

A man goes swimming in a pond. As he swims, which reaction provides energy to power his muscles?ATP regenerates from ADP using energy in glucose.
The ADP molecule adds a phosphate group and produces ATP.
ATP loses one phosphate group and converts to ADP.
NextReset

Answers

The answer is ATP loses one phosphate group and converts to ADP.

ATP stores potential energy in the form of chemical bond. By breaking this bond and removing one phosphate group from ATP, which is then converted to ADP, great amount of energy is released and it is ready to be used.

A protein has been used by comparative molecular biologist to show the evolutionary path of how organisms did what things in regards to energy?

Answers

Answer:

Cytochrome C; it provides evidences that there is similarities in the respiratory pathways for producing ATPs by  all living organisms especially mammals.

Explanation:

Cytochrome c is located in the intermembranes of mitochondria, and it functions in the transfer of  of one electron in electron transport chain,(ETC) needed for  generation of proton motive force;  for generation of energy in the synthesis of ATPs by ATPase synthase  during chemiosmosis. Its allows oxdation-reduction by the switching of its iron ii to iron iii. during electron transports.However its iron atoms does not undergo oxidation with  oxygen. This feature makes it stable and  an ideal carrier of electrons.

Its amino acid sequences is very similar in all living organisms especially  between mammals(e.g man and chimpanzees)with little variation in few amino acid residues due to mutation.This similarity in its amino acids sequences in all  living  organism together with small molecular size makes it ideal  molecular evidence  for studying comparative molecular evidence of  evolution.

This is because it can be used  to trace  the pathways of respiration to synthesize energy, and therefore to conclude that  most  organisms share common ancestry, since a very similar protein sequence in  a structure(Cytochrome c) participated in unique ETC mechanisms  in all, needed for energy synthesis .

Which of the following describes the properties that allow capillaries to exchange gas between blood cells and surrounding tissue? a. Capillaries are short vessels with thin walls that create strong pressures forcing gas-infused blood to diffuse to the surrounding tissue.
b. Capillaries have thin walls and narrow diameters so that blood cells come close to the thin walls, across which gases can diffuse to surrounding tissue.
c. Capillaries have valves along their walls that allow blood cells to move through them to surrounding tissue, where gas exchange can occur.
d. Capillaries regulate the pressure of blood within them so that a steady stream of gas-infused blood cells passes into the surrounding tissue.

Answers

The answer is b. Capillaries have thin walls and narrow diameters so that blood cells come close to the thin walls, across which gases can diffuse to surrounding tissue.

Capillaries are the smallest of all blood vessels. They have very narrow diameters (5-10 micrometers) and thin walls. All of this allow the blood cells to come close to the walls and cross them so gases diffusion to surrounding tissue can occur.

Through the process of elimination:
- a. is not the right choice because thin walls could not persist strong pressure.
- c. is not the right choice because capillaries do not have valves like veins do.
- d. is not the right choice because capillaries are that small they cannot regulate the blood pressure within them.

Answer:

THE "B" ANSWER IS WRONG...I JUST TOOK THE TEST

Explanation:

A person who has allergies has a compromised immune system because the body's immune system.attacks its healthy cells.

overreacts to an antigen.

steals nutrients from healthy cells

Responds to mutagensPlease Wait

Answers

A person who has allergies has them because his or her body over reacts to a material that would otherwise be ignored. It is an overreaction of the immune system triggering a immune attack response that is unneeded. For instance, A person with a peanut allergy has a body whose immune system flags the peanut protein as an intruder and attacks it. It produces antibodies and causes growning reactions that can be life threatening and cause anaphylaxis.

Answer: Overreacts to an antigen

Explanation:

Yes
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The increased ranges of plant and insect species resulting from climate change has only negative consequences. Please select the best answer from the choices provideda. True b. False
Mr. Potter’s physical science classes conducted an experiment to determine the density of aluminum. Here are the density values each class period came up with: 1st hour = 3.1 g/ml, 2nd hour = 3.05 g/ml, 3rd hour = 1.9 g/ml, 4th hour = 2.35 g/ml, 5th hour = 4.2 g/ml, and 6th hour = 4.0 g/ml. If Aluminum’s true density is 2.7 g/ml, how would you group the class values based on accuracy?a. Group: 1st, 3rd, 5th, and 6th hours, with one recorded decimal place in their values Group: 2nd and 4th hours, with two recorded decimal places in their values b. Group: 3rd and 4th hours, with values under the true density Group: 1st, 2nd, 5th, and 6th hours, with values over the true density c. Group: 3rd hour, with a 1 value Group: 4th hour, with a 2 value Group: 1st and 2nd hours, with 3 values Group: 5th and 6th hours, with 4 values d. Group all classes as accurate
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