What Is a Sprain?
A sprain is caused by stretching or tearing a ligament, or the connective tissue between bones. Ligaments help support your 360 joints, enabling you to move your elbows, knees, hips, and other parts of the body.
Sprains can be mild, moderate, or severe, but symptoms of all three types of sprains commonly include:
Bruising
Inflammation
Pain
Swelling
Sprains can be caused by direct or indirect trauma to a joint, such as a fall or a hit. You will typically feel a pop or tear in the joint when a sprain occurs. A severe sprain can immediately cause extreme pain because the ligament tears completely, making the joint nonfunctional. Moderate sprains are partial ligament tears that create unstable joints. A mild sprain stretches the ligament, which does not loosen the joint.
What Is a Strain?
Strains are injuries of your muscles or your tendons, which connect muscles to bone. Typically caused by overuse of muscles and tendons, symptoms of strains can include:
Cramping
Inflammation
Muscle spasm
Muscle weakness
Pain
Swelling
Severe strains can cause your muscle and/or tendon to be partially or completely torn, leading to debilitation. Moderate strains can partially affect muscle function since the muscle or tendon is likely only slightly torn. If you have a mild strain, your muscle or tendon is slightly stretched, not torn.
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Anything that you can do to harm yourself.
Carcinogens are found within cigerattes. Carcinogen refers to any subctance or agent that tends to produce a cancer.
Answer:
D. Yes, two hydrogen bonds could form between thymine and cytosine.
Explanation:
A hydrogen bond (often informally abbreviated H -bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is covalently bound to a more electronegative atom or group, particularly the second-row elements nitrogen (N), oxygen (O), or fluorine (F)—the hydrogen bond donor (Dn)—and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac).
The formation of stable hydrogen bonds depends on the distance between two strands, the size of the bases and geometry of each base. Stable pairings occur between guanine and cytosine and between adenine and thymine (or adenine and uracil in RNA).
One hydrogen bond could form between the C4 carbonyl group on thymine (a hydrogen bond acceptor) and the C4 amino group on cytosine (a hydrogen bond donor). Another hydrogen bond could form between N3 of thymine (a hydrogen bond donor) and the N3 of cytosine (a hydrogen bond acceptor). Note that the C2 carbonyl groups found on both bases are both hydrogen bond acceptors and therefore a hydrogen bond cannot be formed between them.
Answer:
3
Explanation:
Vaccines protect travelers from serious diseases. Depending on where you travel, you may come into contact with diseases that are rare in the United States, like yellow fever. Some vaccines may also be required for you to travel to certain places.
