The form of RNA that your are referring to is tRNA. tRNA stands for t(ransfer) R(ibosomal) N(ucleic) A(cid). tRNA transports amino acids to the ribosome during protein synthesis.
D is the answer to this question....
Answer:
A. destruction of the beta-lactam ring of the penicillin
Explanation:
Penicillins and other antibiotics in the beta-lactan family usually contain a characteristic four-membered ring of beta-lactam.
A penicillin is capable of killing bacteria by binding β-lactam to DD-transpeptidase (a bacterial enzyme that binds peptidoglycan chains to form rigid moving cell walls), inhibiting its activity and preventing the formation of a new cell wall.
Without a cell wall, bacterial cells become vulnerable to external water and molecular pressures, and thus die quickly.
Bacteria can generate resistance to penicillin by producing beta-lactamase, a bacterial enzyme that destroys the penicillin beta-lactan ring, rendering it ineffective.
An example of penicillin-resistant bacteria is <em>Staphylococcus aureus</em>, which produces high amounts of β-lactamase. This bacterium can cause skin, blood or lung infections.
Answer: Early signs are loss of muscle mass, oedema, problems with keratinous area e.g. skin, hair, nails. The longer-term result is kwashiorkor for which the classic sign, particularly in children, is a bloated abdomen.
Explanation:
Without adequate protein intake, the body begins to conserve energy and redirects protein from muscle to other higher priority needs, such as maintaining basal metabolism. One of the signs is oedema, the retention of fluid due to decreased serum albumin levels. Keratin is a protein found in skin, hair and nails and hair loss can also occur. The long-term result is called kwashiorkor, when the symptoms become severe, such as fluid retention giving the classic picture in children of an emaciated child with a bloated abdomen.
If protein deficiency is concurrent with energy deficiency, a condition called marasmus occurs, in which muscle wasting and severe weakness result from using protein as sn energy source.
The correct answer is taking the test too early in the pregnancy.
A pregnancy test is a device used to test your blood or urine in order to determine whether you are pregnant or not. A pregnancy test works by detecting specific markers in your urine or blood. One of the most common marker used is human chorionic gonadotropin (hCG), a hormone produced after the implantation of the fertilized egg on the uterus. This hormone is detectable in the urine only 10 days after the fertilization of the egg, meaning that if a woman takes the pregnancy test too early it may have a false negative result.