What types of cells in plants function like stem cells in animals, and how do they function?
What will be an ideal response?
Initials are the daughter cells of a dividing apical meristem cell. This initial remains part of the
meristem. A derivative, the other daughter cell, becomes the source of specialized cells. Initials are
continually resupplied in the meristem.
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The primary structure of a protein
A) is important for determining the secondary and tertiary structure of a protein. B) is simply the order of amino acids from one end of the protein to another. C) is important both genetically and structurally. D) is the linear sequence of amino acids that are linked together by peptide bonds. E) all of the above
Why is it not surprising that AIDS patients frequently suffer a viral-induced tumor?
A. HIV genomes integrate into the host cell chromosome. This integration might result in loss of control of the cell cycle (also known as cancer). B. The immune system's CD4+ T cells are directly responsible for elimination of tumor cells. HIV attacks them and eliminates them, making a person more susceptible to cancer. C. The therapies for HIV are highly mutagenic, which may lead to cancerous states in people taking the drug regimen. D. Products of an active HIV infection are highly mutagenic-so, as a person's illness progresses, these mutagenic compounds build up and are more capable of inducing a cancerous state.
In the mRNA codons, UUU encodes for phenylalanine (Phe), AGU encodes for serine (Ser), UGG encodes for tryptophan (Try), and CGA encodes for arginine (Arg). The DNA base sequence to encode for a protein try-arg-ser would be
A. ACCGCTTCA. B. TCCGCUUCA. C. UCCGCTTCU. D. UGGCGAAGU.
Which of the following is not an energy source for muscle contraction?
A. fatty acids B. glycogen C. triglycerides D. starch E. glucose