What component is not found in the cytoplasm of an egg?
a. Yolk proteins
b. mRNA transcripts
c. Yolk fatty acids
d. tRNAs
e. Ribosomes
c
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Proteins known as chaperones are found only in Bacteria
Indicate whether the statement is true or false.
Which one of the following is not a steroid that uses a type I receptor?
A. estrogen B. glucocorticoids C. thyroid hormone D. androgens
Cells are often ground up with abrasive to get to their internal enzymes/molecules, followed by removal of the abrasives. Here are three situations and three outcomes. What is the correct interpretation of the results?
In situation #1, radioactive amino acids are added to cell material, and radioactive proteins are produced. In situation #2, radioactive amino acids, cell material, and the enzyme DNAse (degrades DNA) are added together. Radioactive proteins are still produced. In situation #3, the ground-up cell material is allowed to sit for 24 hours before radioactive amino acids and DNAse are added to it. No radioactive protein is produced. What is the most likely interpretation? A. RNA polymerase has no activity after 24 hours, so no mRNA is transcribed and translated into radioactive proteinsin the last scenario. B. The radioactivity in the amino acids is altering/degrading the tRNA molecules, leading to no protein production in the last scenario. C. Natural RNAses present in the ground-up material will degrade any existing mRNAs in that 24-hour interval. Added DNAses breakdown DNA so that new RNAs are not synthesized.This will lead to a loss of capability to translate protein in the last scenario. D. The results are not interpretable from the information given.
Guard cells are often associated with ____, special epidermal cells that provide a reservoir of water and ions
a. companion cells b. cuticle cells c. cork cells d. sclerenchyma cells e. subsidiary cells