Which of the following statements concerning allografts is TRUE?
A) They are the best type of transplants because they are not associated with rejection.
B) They induce strong type IV hypersensitivity reactions and must be treated with immunosuppressive drugs.
C) They always require complete destruction of the recipient's bone marrow cells.
D) They are impossible to perform because the antigens between donor and recipient are so different.
E) They are the rarest type of transplants.
B
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Why can eggs be larger than other cell types?
a. eggs contain a large store of nutrients b. eggs do not perform exocytosis c. other cell types need higher concentrations of glucose d. other cell types divide when they get too large e. other cell types require phospholipids for organelle membranes
Codons are ____ that encode the information for a specific amino acid in a protein
a. made of two polynucleotide strands b. ribosomal subunits c. mRNA templates that are transcribed into tRNA d. post-translational templates of tRNA
e. triplets of nucleotides in mRNAAlthough beneficial, group living also has many costs. Which of the follow is NOT a cost to an individual of living in a group?
a) increased opportunity for reciprocal altruism b) increased competition for mates c) increased risk of infanticide or injury to offspring d) increased risk of disease and parasites e) increased competition for resources
Select the incorrect statement.
A. Compounds contain molecules. B. Atoms are joined by chemical bonds forming molecules. C. Molecules may contain two of the same type of atom. D. Molecules contain atoms. E. Compounds may contain only one type of atom.