Which cell(s) is(are) diploid?
a. 4
b. 5
c. 6
d. 5 and 6 only
e. 4, 5, and 6
D
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When the DNA sequence of the gene that codes for the peptide hormone insulin is compared in two mammals (e.g., humans and rats), most of the sequence differences are silent mutations
These far outnumber sequence differences that result in amino acid substitutions. Why might this be? A. Mutations are random with respect to an organism's needs. B. Amino acid substitutions often result in proteins that have lost or compromised function, and so are selected against. C. A DNA sequence is more likely to mutate if the change does not alter the amino acid sequence. D. Most amino acid substitutions result in a beneficial phenotype that improves fitness and results in a greater number of offspring. E. Silent mutations occur in noncoding DNA sequences.
Erwinia carotovora is a species of bacteria that uses injectisomes to inject proteins into plant cells, ultimately causing tissue rot. E. carotovora is an example of a:
A. mutualist B. pathogen C. predator D. decomposer E. producer
Often in complete dominance, the recessive allele codes for a nonfunctional ________
Fill in the blank(s) with correct word
Which cnidarian structures would be involved in mounting a defense against predation? Check all that apply.
A. cnidocytes. B. gastrovascular cavity. C. mesoglea. D. nematocysts. E. cnidocils.