A signal sequence
A) directs RNA nucleotides to a particular gene.
B) attracts tRNAs to an mRNA.
C) is the first part of a protein's amino acid sequence that helps to direct it to a certain part of the cell.
D) is a coding codon that mutates into a stop codon.
C) is the first part of a protein's amino acid sequence that helps to direct it to a certain part of the cell.
You might also like to view...
What group of fungi has the ability to penetrate its host's cell wall, thus increasing the efficiency with which materials are passed from fungus to host?
A) ectomycorrhizal fungi B) arbuscular mycorrhizal fungi C) endophytes D) lichens
Where do plants typically store their starches and sugars for later use?
A. In the leaves B. In the roots C. In the stems D. In the flowers
Which of the following represents the strongest evidence that two of the three middle ear bones of mammals are homologous to certain reptilian jawbones?
A) They are similar in size to the reptilian jawbones. B) They are similar in shape to the reptilian jawbones. C) The mammalian jaw has fewer bones than does the reptilian jaw. D) These bones can be observed to move from the evolving jaw to the evolving middle ear in mammalian embryos.
Identify the correct order of events for a person who has contracted an HIV infection.a. The immune system reduces the virus levels in the blood.b. HIV infected cells proliferate, increasing the number of infected helper T cells.c. Patient experiences mild flu-like symptoms.d. A deficiency in the number of helper T cells causes the patient to develop additional health problems.e. The blood contains a high amount of the virus.f. The virus mutates so it is not recognizable by the immune system.
A. d - e - c - a - b - f B. e - c - a - b - f - d C. d - c - a - b - f - e D. e - c - b - a - f - d E. e - a - b - c - f - d