The ____ gives structure to many unwalled, single-celled protists.
A. contractile vacuole
B. pellicle
C. Golgi body
D. endoplasmic reticulum
E. nucleus
Answer: B
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Analysis of the nucleotide sequences of genes coding for phytochrome pigments suggest that the ancestors of
angiosperms were adapted for survival in ____.
a. freshwater aquatic environments b. sunny, xeric habitats c. shady forests d. habitats with very cold winters e. coastal marine waters
The purpose of this image was to promote
1.a sleep aid for soldiers
2.information from a war zone
3.newly discovered antibiotics
4.none of the choices
Which of the following situations is NOT a way in which a baby acquires normal microbiota?
A. The baby acquires the residential microbiota in the colon after the first meal. B. Staphylococcus epidermidis is transferred from the hospital staff to the newborn after delivery. C. microbes cross the placenta during pregnancy. D. microorganisms grow in the respiratory tract after the baby's first breath. E. microbes enter the nose and mouth when the baby is in the birth canal.
Cells carry out three major types of work; which of the following involves the synthesis of macromolecules as well as the breakdown of substances for their energy?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.