A human zygote contains 46 chromosomes.
Answer the following statement true (T) or false (F)
True
A zygote results from the union of a sperm with 23 chromosomes and an egg with 23 chromosomes.
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A sequence variant of a gene is called a(n)
A) allele. B) mutation. C) nucleotide polymorphism. D) ribotype.
In antibody-mediated immunity, what happens immediately after B cells are activated?
a. The foreign antigen-MHC complex is displayed on the cell surfaces. b. Activated T helper cells interact with the B cells. c. The B cells are cloned. d. Antibodies combine with antigens on the pathogen surface. e. The B cells becomes plasma cells.
The surface area of a cell is important because
A. the surface area limits the amount of molecular exchange that can take place between the cell and its surroundings. B. a small surface area allows the cell to protect itself from foreign organisms. C. a large surface area makes the cell more fragile. D. the surface area determines the genetic capabilities of the cell.
What would happen if snRNAs did not recognize the branch point within an intron?
A. A 3' poly A tail would not be added to the transcript. B. A lariat would not form. C. snRNAs would not base pair with the 5' end of the intron. D. A 5' cap would not be added to the transcript.