The cells of the immune system that are responsible for attacking cells that have been infected with a virus are the:
a. B-cells
b. cytotoxic T-cells
c. helper T cells
d. suppressor T cells (T regulatory cells)
Answer: b. cytotoxic T-cells
You might also like to view...
Alleles are ____
a. sex chromosomes b. somatic cells c. crossover sites d. attachment sites for microtubules e. different versions of the same gene
The fact that the two alleles of each gene are packaged into separate gametes because they move apart from each other during gamete formation is Mendel's law of
a. independent assortment. b. crossing over. c. segregation. d. random fertilization. e. population dynamics.
Plasmids of bacteria often have genes involved in:
a. motility. b. reproduction. c. viral resistance. d. photosynthesis. e. antibiotic resistance
Answer the following questions true (T) or false (F)
1. The archenteron is mostly made of the mesoderm. 2. The notochord induces the formation of the neural plate in vertebrates. 3. Somites are repeating blocks of ectodermal tissue.