Carbon has 4 valence electrons and oxygen has 6. Carbon dioxide would contain ________.
A. two double covalent bonds
B. one single covalent bond
C. four hydrogen bonds
D. two single covalent bonds
Answer: A
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Answer the following statement true (T) or false (F)
Which type of epithelial cells act in absorption and secretion?
a. Columnar and stratified squamous b. Columnar and cuboidal c. Simple squamous and columnar d. Cuboidal and simple squamous e. Stratified squamous and columnar
Pathogenicity islands are discrete genetic elements that encode virulence factors, such as toxins, adhesins, secretion systems, and iron transport proteins. These islands can be horizontally transferred between bacteria, resulting in enhanced virulence and fitness in the recipient.
a. true b. false
sperm cells get energy to power heir movement from __ contributed by the __
Fill in the blank(s) with the appropriate word(s).