Early sleep research began when researchers noted that physiological changes create _______ that can be measured during sleep.

1 answer:

3 0

Hormones -- such as melatonin and cortisol; the former signals the body to go to bed, while the latter signals for the sleeping person to wake up -- are created by physiological changes.

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A cell that is specialized to receive and transmit information is called a(n):

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A cell that is specialized to receive and transmit is called a neuron

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A researcher has performed a BLASTp search for a protein of interest. He identifies a globular protein that shares 30 percent of

Alex_Xolod [135]

Options are not provided in the question. The complete question is as following:

A researcher has performed a BLASTp search for a protein of interest. He identifies a globular protein that shares 30 percent of its amino acid sequence and positioning with his target protein. What can he conclude about the shape of his protein of interest?

a) It is also a globular protein.

b) It is a fibrous protein.

c) It has only a primary structure.

d) It demonstrates only pleated sheets as part of its structure.

e) The researcher can conclude nothing about his protein of interest.

Answer:

a) It is also a globular protein.

Explanation:

Globular proteins are one of the common form of protein (the other are fibrous, disordered, and membrane proteins) having spherical shape.

Protein-protein BLAST (blastp), This software returns the most related sequences of protein from the protein database defined by the user, provided a protein query.

So, the blastp has searched for globular protein.

Hence, the correct option is a.

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3 years ago

The heart is classified as a

denis23 [38]

Answer:a mscle which controls the body

Explanation:

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How are muscles the contractile specialists of the body?

Mariana [72]

Muscle cells are uniquely adapted to contractile function due to three main things. FIrst, they have a large capacity for storage of readily available glycogen to use for work. Second, they contain the actin and myosin cross-bridge cycling structure to perform a contraction of a muscle fiber. Finally, each fiber has central nervous innervation to control contraction and relaxation of the muscle fibers.

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We would expect that a 15-nucleotide sequence that includes a stop codon at the end (as part of the 15-nucleotide sequence) will

slega [8]

Answer: Four amino acids.

Explanation:

RNA (ribonucleic acid) and DNA (deoxyribonucleic acid) are polymers made up of long chains of nucleotides. Thus, a nucleotide is the basic building block of nucleic acids and consists of a sugar molecule (ribose in RNA or deoxyribose in DNA) linked to a phosphate group and a nitrogenous base. The nitrogenous bases can be Adenine (A), Thymine (T), Cytosine (C), Guanine (G) or Uracil (U) replacing T in RNA. DNA is the molecule that stores the genetic information to synthesize polypeptides or proteins (set of amino acids). When proteins need to be created, DNA is transcribed into RNA and this RNA is translated in ribosomes to create polypeptides.

Complementarity is the ability to combine with their complement. A and T (or U) are complementary, while C and G are complementary to each other. Complementarity is the principle of replication and transcription, because it is a propery of both DNA and RNA sequences. Their the nucleotide bases at each position of the sequences are complementary, allowing cells to copy information.

Nucleotides in RNA are grouped into codons, which consist of groups of 3 nucleotides where each codon codes for an amino acid. Therefore, the sequence of bases in nucleic acids determines which protein will be synthesized. Protein synthesis begins with a start codon (AUG, which codes for the amino acid methionine) and ends with a stop codon (UGA, UAG and UAA). So, if there are 15 nucleotides, there are 15 bases. Since they are grouped in groups of 3, we will have a polypeptide of 4 amino acids.

3 nucleotides form a codon, so 12 nucleotides form 4 codons giving 4 amino acids. The last codon, is formed by the last 3 nucleotides and form the stop codon that stop protein synthesis.

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2 years ago