CFC (chlorofluorocarbon), including freon, is used as the aerosol propellant. An aerosol is a suspension in the gaseous form of solid or liquid particles. When these compounds reach the stratosphere, UV light affects them and they release chlorine atoms. Chlorine atoms are capable of breaking down ozone molecules. With fewer ozone molecules, the ozone layer becomes thinner and harmful UV light passes through it causing many health problems, such as skin cancer.
Transfer RNA (tRNA) is a type of ribonucleic acid. It brings amino acids to the ribosomes and mRNA for the structural organization into proteins. Thus, option D is correct.
tRNA is an adaptor molecule that decodes the mRNA sequences in the form of amino acids through the ribosomes. It is involved in the translation process of complex protein synthesis.
tRNA transports the amino acids (codons) to the ribosomes to join them with their complementary (anti-codon) sequence for the polypeptide assembly.
Therefore, the tRNA carries amino acids for polypeptide formation.
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The complete question is attached to the image below.
Answer:
The long-term effects are unknown and have not been studied because it is a fairly new technology.
Explanation:
Just took the test.
Answer:
cell membranes need to made from a more permeable material to allow things to pass in and out more easily. and cell walls are not.
Explanation:
A. stop responding to growth regulators
B. stop dividing to produce daughter cells
C. generate hormones that combat tumors
D. produce cells without a defective p53 gene
ANSWERS TO CELL PRACTICE TEST
1.C
2.A
3.D
4.D
5.B
6.A
7.B
8.A
9.B
10.A
Some of the major difference in the digestive system of Cnidarians and echinoderm are
Cnidarians have an incomplete digestive system specifically extracellular digestion occur, where enzymes break down the food particles are degraded by enzymes and absorption occur in its gastrovascular cavity.
While in echinoderms, the digestive system may vary depending on types of species and need of their food types.
They use of tube feet to reach to their food sources and move their mouth area toward the food. Their digestive system relatively simple when compare with human.
In Cnidaria only have gastrovascular cavity, diploblastic, presence of stinging cell, Hydrostatic skeleton etc.
In Echinoderm have triploblastic, water vascular system with unique characteristics, calcareous endoskeleton etc.
Echinoderms have no excretory or respiratory systems.
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A. Superfund act
b. Nuclear Waste policy act
c. Clean air act
d. Clean water act