Heparin, a highly negatively charged glycosaminoglycan, is used clinically as an anticoagulant. It acts by binding several plasma proteins, including antithrombin III, an inhibitor of blood clotting. The 1:1 binding of heparin to antithrombin III seems to cause a conformational change in the protein that greatly increases its ability to inhibit clotting. What amino acid residues of antithrombin III are likely to interact with heparin

Answer:

Positively charged amino acids

Explanation:

Heparin is an acid polysaccharide that has a strong negative charge due to the sulfate groups on its glucosamine residues. This negative charge confers to heparin anticoagulant activity. The negatively charged groups in the heparin molecule can interact with positively charged (basic) residues, such as arginine (Arg) and lysine (Lys) of plasma proteins. For example, it has been shown that lysine amino acid residues of antithrombin III may be involved in the binding with heparin.

Gas exchange involves the transport of two respiratory gases, oxygen and carbon dioxide. Match each statement into the appropriate items whether it applies to oxygen only, carbon dioxide only, or both oxygen and carbon dioxide.

a. Net diffusion from alveoli capillaries
b. Waste product of cellular respiration
c. Sometimes transported as bicarbonate
d. Net diffusion from lung capillaries to alveoli
e. Net diffusion from body tissues blood
f. Enters alveoli during inhalation
g. Required for cellular respiration
h. Transported by hemoglobin

Two receptors bind to a same chemical messenger, but the concentration of this chemical messenger required to reach a certain number of bound messengers for one receptor is twice as great as the concentration for the other receptor. Thus, these two receptors have same ________, but different ________, to this chemical messenger

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What is the relationship between anabolism and catabolism?

Choose 1 answer:


(Choice A) A Anabolism and catabolism are identical processes.

(Choice B) B Anabolism builds molecules using the energy produced during catabolism.

(Choice C) C The breakdown of molecules in anabolism provides energy for catabolism.

(Choice D) D Catabolism synthesizes large molecules that are destroyed by anabolism.

What changes accompany cell determination? HINT: It's not A.

A. changes from determinate to indeterminate pathways
B. molecular changes, such as expression of certain genes for tissue-specific proteins
C. changes in zona pellucida after binding of sperm to egg plasma membrane

The digestive system converts proteins into smaller molecules called .


A. Amino acids

B. Vitamins

C.Fatty acids

How does photosynthesis and cellular respiration compare to each other

Species with ___ genetic variation are ____ likely to survive?

A. More, less
B. Less,less
C. More,more
D.less, more

Earth has five layers based on physical characteristics. The diagram below shows these
five layers. Which letter represents the asthenosphere, the soft layer on which the
tectonic plates move?

What molecule are we testing for to determine if the milk was properly digested?

Question 11 options:

galactose


lactase


glucose


lactose

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In a certain breed of cow the gene for red fur, R, is codominant with that of white fur, W.What would they be if you breed a red & white cow with a red & white bull?
A. G: 100% RW P:red and white cow
B. G:25 % RR 75% RW P: red
C. G:25% RR, 25% WW, 50% RW P: 1 red cow, 2 red and white cows, 1 white cow
D. G: 50% RR, 50% Rr P: all red cows

Nitrogen is important for creating both protein and carbohydrates.
True
False

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Directions: Drag the nitrogenous bases to the correct locations on the image. Each base can be used more than once, but not all bases must be used. A section of a DNA molecule is shown in the diagram below, but only one strand is complete. Add the correct nitrogenous bases to the molecule to form two complementary DNA strands. C T G U А TG CTC A G A C Reset Next Question​

What is the role of vascular tissue in plants that contributes to photosynthesis?

A. covering plant like a skin
B. transporting water and nutrients
C. . producing and storing food
D. gathering the energy from sunlight

Some caves are created when water dissolves limestone below ground. Which part of the water cycle is most responsible for the formation of caves?

The _________________________ are responsible for packaging and distributing the materials in a cell. * Fill in the blank(s) with the correct answer.

Name one sign a plant is deficient in nitrate

1. Explain the advantages of compartmentalization in eukaryotic cells.
2. Explain how the nucleus controls protein synthesis in the cytoplasm.
3. List the components of the endomembrane system, and describe the structure and
functions of each component.
4. Describe the pathway of a newly synthesized protein through the endomembrane system
before is secreted out of the cell. What organelles will the protein visit?
5. Explain the biological/physiological relevance of mitochondrial cristae and chloroplast
thylakoids.
6. Describe the evidence that mitochondria and chloroplast are semiautonomous organelles.
7. Explain the mechanism by which microtubules transport vesicles through the cell.
8. Describe the basic structure of the plant cell wall and its function. Discuss the biological
relevance of plasmodesmata.
9. Compare and contrast the role of phospholipids and cholesterol in cell membrane
structure and function.
.0. Define diffusion. Explain why diffusion is a spontaneous process.
.1. Compare and contrast the role of transport proteins and receptor protein in cell
membrane function.
2. Define membrane potential and electrochemical gradient
3. Explain how endocytosis and exocytosis contribute to plasma membrane recycling.
4. Distinguish among osmosis, facilitated diffusion, and active transport.
15. Imagine that you can attach a molecular flag in the membranes of the rough endoplasmic
reticulum (RER). Where would you expect to find such flag if vesicles formed in the RER
deliver their content outside of the cell?

TRUE OR FALSE Nephrons located in the renal cortex and renal medulla.

Emotional response of teenage girls​

Q4: Describe how crossing over can lead to new variations in genes. ​

Explain why global efforts are being made to mass vaccinate populations and the importance of herd immunity in wiping out disease nationally and globally?

Identify Complete the figure by writing the location of each stage of cellular respiration

Aubrey uses the following formula to calculate a required value. Which elements of the formula use mixed cell referencing?

If modern organisms have a lot of homologous structures, what inference
might paleontologists make about those organisms?

They are reptiles

The organisms have a common ancestor.

One organism evolved from the other

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___ fill with the blood returning to the heart​

rain results when water from the atmosphere condenses