Most changes to the universal genetic code
a. require corresponding mutations in rRNAs.
b. are to allow encoding of more than twenty amino acids.
c. occur in nuclear genomes.
d. occur in yeast species.
e. affect termination codons if in the nuclear genome.
Ans: e
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Based on what you know about the genetic code, list one or two codons that would most likely code for the same amino acid. This is a hypothetical question; don't look at the table showing the genetic code
What will be an ideal response?
Regarding Investigating Life 22.5, why might these trees only secrete nectar on young leaves rather than larger, more mature leaves?
A. These leaves are near the lateral meristem, where secondary growth will help strengthen branches against the ants in domatia. B. These leaves have internodes and more leaflets to distribute any adverse effects from the ants living in domatia. C. These leaves perform more photosynthesis, being newer, and therefore make the most nectar. D. These leaves have more cellulose, because being newer, this form of carbohydrate is a better sugar for the nectar. E. These leaves are near the apical meristem, attracting ants to the entire length of the branches.
Plasma cells and memory cells are types of ________ lymphocytes; both types of cells secrete proteins called ________ as part of the immune response
Fill in the blank(s) with correct word
Which of the following mechanisms can alter allele frequencies?
a. Genetic drift b. Natural selection c. Gene flow d. All of the listed responses are correct. e. None of the listed responses are correct.