___ are proteins that form channels between cells, allowing ions and small molecules to diffuse directly from one cell to the other? A) cadherins B) tubulins Dyneins D) occludins E) connexins Which of the following statements about oxidative phosphorylation is not true? A) Oxygen is reduced to water . B) As electrons move down the electron transport chain, the released energy is used to transport hydrogen ions across the inner mitochondrial membrane. C) Hydrogen ion movement from the mitochondrial matrix to the intermembrane space activates the enzyme ATP synthase. D) More ATP can be produced when NADH provides electrons to the electron transport chain than when FADH2 provides electrons. E) The components of the electron transport chain are located on the inner mitochondrial membrane. Which of the following isn't an action of insulin on liver cells? A) activate glycogen synthetase B) increase gluconeogenesis C) inhibit glucose-6-phosphatase D) increase glucose uptake E) activate glucokinase
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
___ are proteins that form channels between cells, allowing ions and small molecules to diffuse directly from one cell to the other?
A) cadherins
B) tubulins
Dyneins
D) occludins
E) connexins
Which of the following statements about oxidative phosphorylation is not true?
A) Oxygen is reduced to water
. B) As electrons move down the electron transport chain, the released energy is used to transport hydrogen ions across the inner mitochondrial membrane.
C) Hydrogen ion movement from the mitochondrial matrix to the intermembrane space activates the enzyme ATP synthase.
D) More ATP can be produced when NADH provides electrons to the electron transport chain than when FADH2 provides electrons.
E) The components of the electron transport chain are located on the inner mitochondrial membrane.
Which of the following isn't an action of insulin on liver cells?
A) activate glycogen synthetase B) increase gluconeogenesis C) inhibit glucose-6-phosphatase D) increase glucose uptake E) activate glucokinase
Answer E: connexins
Explanation:
Connexins are a group of proteins synthesized on the membranes of ER. They are intercellular membrane channel
proteins between the gap junctions. It helps in the diffusion of ions, metabolites, and small molecules across the cell membrane from one cell to the other. Hence the correct answer is "E".
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