Please match the type of T cells with the statements that most accurately describe them to test your understanding of the relationships between the types of T cells and their receptors.
CD8
A) All T cells
B) Helper T cells
C) Cytotoxic T cells
C) Cytotoxic T cells
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Which of the following amino acids would most likely not be found in an ? helix?
A. methionine B. lysine C. phenylalanine D. proline E. glutamine
Which of the following characteristics of the lactose operon is not true of the galactose operon?
A. Repressor binding prevents RNA polymerase from binding to the promoter. B. CRP activates expression when bound to cAMP. C. Expression is high when glucose levels are low and the activating metabolite is present. D. Expression is low when glucose levels are high.
Genes that are duplicated within a genome and later diverge in function, such as the RNASE1 and RNASE1B genes in douc langur monkeys, are described as ________
A) duplicated genes B) orthologous genes C) homologous genes D) paralogous genes E) derived genes
A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 × F1 cross?
A) 1:2:1 B) 2:1 C) 3:1 D) 9:3:3:1