If the intake valve opens too early in the cycle, vacuum will be reduced and exhaust gasses will be forced into the intake manifold. When exhaust gasses are forced into the intake manifold, vacuum is adversely affected and the intake runners will soot up. This effect is called "reversion".
An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft.
The work of is intake valve opens when the piston reaches the TDC; compressed air from high pressure tank rapidly flows into the cylinder. The pressure inside the cylinder rapidly increases to the intake pressure. Meanwhile, the mass and temperature inside the cylinder increase.
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Explanation:
GILLS – the gills of a skate are on the underside of their body. Whereas on a shark they're found either side of the head
Answer:
A. Only L-amino acids (except for glycine) are used in proteins.
B. The partial double bond character of the α-C-N bond in the peptide group limits the conformations of the peptide group.
C. Hydrogen bonding within elements of secondary structure stabilize certain atomic geometries.
D. Although any one of 20 amino acids is possible at each position, only one is used.
Explanation:
Proteins are biomolecules composed of one or more chains of amino acid residues which are joined together by peptide bonds (this sequence represents the primary structure of the protein). Proteins are made up of 20 types of amino acids which have diverse properties. The secondary structure of a protein refers to the local structure of the protein backbone, which is stabilized by hydrogen bonding between amino groups (—NH2) and carboxyl groups (—COOH) in neighboring areas of the protein. The most common secondary structures in proteins include alpha helices, beta sheets, and random turns. Moreover, the tertiary structure in proteins describes the packing of these secondary structures. The peptide bond (CO–NH) is a stable covalent bond that has a rigid planar structure and acquires partial double-bond properties, thereby peptide bonds undergo very little rotation (i.e., rotation around peptide bonds is restricted). With the exception of glycine, all amino acids are stereoisomers, i.e., there exist mirror images of their structures which are labeled as L (left-handed) and D (right-handed) in order to differentiate between mirror images. All amino acids in proteins have the L-configuration.
Answer:
Guanine
Explanation:
There are <em>four</em> nitrogenous bases in DNA, <em>two purines</em> (adenine and guanine) and <em>two</em> <em>pyrimidines</em> (cytosine and thymine)
Adenine always bonds with thymine, and cytosine <em>always bonds with</em> guanine.
Answer:
The correct answer would be telophase.
Telophase is the last phase of the mitotic phase.
- During this phase, the events took place prophase are usually reversed.
- Chromosomes reach the terminal ends of the dividing cell.
- New nuclear membrane forms around each daughter nuclei.
- Nucleoli also reappear.
- Chromosomes unfold or decondensed back to form chromatin.
- Cell continues to elongate which is followed by cytokinesis.
Hence, telophase is the stage of cell cycle in which the mentioned events are reversed.