Class __________ includes mostly extinct species and a few current species such as feather stars and
sea lilies.
a. Asteroidea
b. Holothuroidea
c. Ophiuroidea
d. Echinoidea
e. Crinoidea
E
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Guidelines suggest that only ____________________ (number) embryo(s) be transferred to the woman's uterus following IVF, in order to reduce the incidence of multiple births
Fill in the blank(s) with correct word
Which of the following statements is correct?
A) For every codon, there is one amino acid. B) For every amino acid, there is one codon. C) A codon may signify more than one amino acid. D) Three codons make up an amino acid. E) Three amino acids make up a codon.
A bond in which the positive end of one polar molecule is attracted to the negative end of another polar molecule is a(n)
A. covalent bond. B. ionic bond. C. electron bond. D. hydrogen bond.
What happens when cells cannot repair the damage caused by a mutagen?
a. the organism is not affected b. the organism is affected temporarily c. the DNA base sequence is not affected d. the DNA base sequence changes permanently