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Biology-060517

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qiangli20171's version from 2017-06-05 06:36

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Question Answer
The cell membrane serves many functions. One of the cell membrane's functions is to help the cell maintain homeostasis. Which of the following statements best supports this claim?
a. The cell membrane contains a polar region and a nonpolar region.
b. The cell membrane contains proteins.
c. The cell membrane contains phospholipids.
d. The cell membrane regulates what goes in and out of the cell.
d.The cell membrane regulates what goes in and out of the cell.
The endoplasmic reticulum is a network of membranes within the cell, and it is often classified as rough or smooth, depending on whether there are ribosomes on its surface. Which statement best describes the role of rough endoplasmic reticulum in the cell?
A. It stores all proteins for later use.
B. It provides an attachment site for larger organelles.
C. It aids in the production of membrane and secretory proteins.
D. It stores amino acids required for the production of all proteins.
C. It aids in the production of membrane and secretory proteins.
Which of the following is primarily responsible for the coding of the amino acids used in the synthesis of cellular proteins?
A. DNA
B. transfer RNA
C. ribosomes
D. Golgi apparatus
A. DNA
Which statement describes the diagram above?
a. DNA transcription is producing ribosomal RNA.
b. DNA translation is producing messenger RNA.
c. DNA transcription is producing messenger RNA.
d. DNA translation is producing ribosomal RNA.
c. DNA transcription is producing messenger RNA.
Which pair consists of terms that represent equivalent units of information?
a. Codon - DNA
b. Gene - polypeptide
c. Chromosome - protein
d. Nucleotide - amino acid
b. Gene - polypeptide
A tRNA molecule with which of the following anticodons would be able to bind to a molecule of lysine (has codons AAA or AAG)?
a. TTT
b. TTC
c. AAA
d. UUC
d. UUC
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