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3 years ago

_________ is a type of tissue consisting of multiple layers of epithelial cells that can contract and expand.

Biology

1 answer:

MakcuM [25]3 years ago

7 0

Answer:

Transitional epithelium

Explanation:

Transitional epithelium consists of a epithelial cells that are arranged in a stratified manner or in multiple layers, which gives the cells a structure or ability to change shape. He epithelium tissues n contract and expand as a result of the arrangement of the cells. The cells are connected by junctional complexes.

The transitional epithelium is found in the organs of the urinary system, especially in the urinary bladder, ureters, and urethra. The transitional epithelium found in the urinary system functions in giving protection, allowing the organ to contract and expand, and also to withstand osmotic pressure.

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Which of the following is a function of a plant cell vacuole?

LiRa [457]

B is the right answer .

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3 years ago

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kogti [31]

The dependent variable is on the Y axis and independent variable is on the X axis.

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2 years ago

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Anna007 [38]

Answer:

Arthropod.

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3 years ago

A television advertisement claims that a certain brand of cough drop reduces coughing for 8 hours. Describe an investigation tha

Liono4ka [1.6K]

Answer:

See explanation below.

Explanation:

Study Design - Partially double-blinded study

The cohort study will be composed of 80 adults (aged ≥18 years) with a clinical diagnosis of constant coughing present as a result of a cold, which would be measured by semiautomated ambulatory cough monitor.

This study will be divided into an experimental group and a control group:

No medication (natural drops; e.g. water; saline solution) - Control group
Cough treatment - Experimental group

Data to be collected:

Participant cough will be recorded every hour (until 8 hours are reached) for two consecutive days (for repetitions) in both groups using semiautomated ambulatory cough monitor and analyzed statistically.

Observations:

Experimental group: If coughing is significantly (statistical analysis) reduced within the 8 hours (after repetitions) and a symptom improvement is observed, the hypothesis that cough drops are effective is valid.

Control group: To determine that cough drops treatment is effective, the no-treatment group should score worst and participant should not show significant improvement.

*In scientific experiments, repetitions are important to prevent bias and error.

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3 years ago

If ethyl alcohol contains almost as much energy as the original pyruvic acid, what can you infer about the efficiency of ferment

shusha [124]

Explanation:

Fermentation has a comparatively low efficiency as it produces the same amount of energy, whereas aerobic respiration produces up to 38 molecules of ATP .

Aerobic respiration in the mitochondria utilizes oxygen for the production of ATP in the Krebs’ or Citric acid cycle via the oxidization of pyruvate( through the process of glycolysis in the cytoplasm).

Within cells, aerobic respiration may not occur due to several factors:

- a lack of inorganic, final electron acceptors
-incomplete or lack of a complete electron transport system
-missing genes for enzymes within the Kreb's cycle

Thus, they utilize other means for the generation of energy in the form of ATP and to replenish NAD+ an oxidized form of NADH, the main electron carrier in glycolysis. Pyruvate is produced in the cytoplasm via glycolysis- it is also used as an electron acceptor in a process called fermentation.

Net production of ATP in fermentation: 2 ATP
Net production of ATP in aerobic respiration ≈38 ATP

Further Explanation:

overall in aerobic respiration: C6H12O6 (glucose) + 6 O2 → 6 CO2 + 6 H2O + ≈38 ATP

In all eukaryotic cells mitochondria are small cellular organelles bound by membranes, these make most of the chemical energy required for powering the biochemical reactions within the cell. This chemical energy is stored within the molecule ATP which is produced. Respiration in the mitochondria utilizes oxygen for the production of ATP in the Krebs’ or Citric acid cycle via the oxidization of pyruvate( through the process of glycolysis in the cytoplasm).

Oxidative phosphorylation describes a process in which the NADH and FADH2 made in previous steps of respiration process give up electrons in the electron transport chain these are converted it to their previous forms, NADH+ and FAD. Electrons continue to move down the chain the energy they release is used in pumping protons out of the matrix of the mitochondria.

This forms a gradient where there is a differential in the number of protons on either side of the membrane the protons flow or re-enter the matrix through the enzyme ATP synthase, which makes the energy storage molecules of ATP from the reduction of ADP. At the end of the electron transport, three molecules of oxygen accept electrons and protons to form molecules of water...

Glycolysis: occurs in the cytoplasm 2 molecules of ATP are used to cleave glucose into 2 pyruvates, 4 ATP and 2 electron carrying NADH molecules. (2 ATP are utilized for a net ATP of 2)
The Citric acid or Kreb's cycle: in the mitochondrial matrix- 6 molecules of CO2 are produced by combining oxygen and the carbon within pyruvate, 2 ATP oxygen molecules, 8 NADH and 2 FADH2.
The electron transport chain, ETC: in the inner mitochondrial membrane, 34 ATP, electrons combine with H+ split from 10 NADH, 4 FADH2, renewing the number of electron acceptors and 3 oxygen; this forms 6 H2O, 10 NAD+, 4 FAD.