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
Biology & Microbiology
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.
Biology & Microbiology
Nearly half of mammal species are ________
a. bats b. rodents c. marsupials d. aquatic
Biology & Microbiology
The DNA components adenine, thymine, guanine, and cytosine are examples of ____
a. phosphates b. sugars c. bases d. genes e. ribosomes
Biology & Microbiology