What is a characteristic of the cell walls of mature plant cells?

a. pectin
b. cellulose
c. glue-like polysaccharides
d. lignin
e. a gluey matrix containing rope-like strands


ANSWER: d

Biology & Microbiology

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A carbon atom with six protons, seven neutrons, and six electrons has a mass number of ____

a. 6 b. 7 c. 12 d. 13 e. 19

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Freezing oocytes has not been as successful as freezing sperm because

A) they undergo an extra meiosis. B) the woman can become dangerously cold. C) ice crystals can form in the abundant, watery cytoplasm. D) the nuclei shatter.

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Nearly half of mammal species are ________

a. bats b. rodents c. marsupials d. aquatic

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The DNA components adenine, thymine, guanine, and cytosine are examples of ____

a. phosphates b. sugars c. bases d. genes e. ribosomes

Biology & Microbiology