Humans are capable of synthesizing 12 of the 20 naturally-occurring amino acids without having to obtain them from our diets
A. true
B. false
A
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A major biological paradox is that genes are generally highly conserved and yet
A. there is very little difference among life forms existing today. B. there is so much diversity among life forms existing today. C. there are a huge number of ancestral genomes no matter how far back we look. D. there are essentially identical development patterns in all species. E. there is very little research into genomic sequences.
Which of the following kind of animal is NOT an amphibian?
A. Caudata B. anuran C. salamander D. Gymnopiona E. amniote
A nuclear envelope has four of the following characteristics. Which is the exception?
a. single lipid bilayer b. continuous with endoplasmic reticulum c. possesses pores d. controls passage of substances into and out of nucleus e. separates DNA from cytoplasm
Is it possible for crossing-over to occur between two linked genes, yet for all of the resulting offspring to have parental genotypes?
What will be an ideal response?