Which of the following is a feature of prokaryotic cells but NOT eukaryotic cells?
A) pili
B) cell wall
C) flagella
D) DNA
A
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B. thuringiens bacteria is a remarkable resource for researchers and farmers alike when it comes to pest control. Why? Select all correct choices
A. It contains a Ti plasmid. B. It produces insect toxins. C. It is responsible for crown gall disease and can be used to kill parasitic plants. D. Its genes can be used to genetically engineer plants. E. It produces cardenolides.
Answer the following statements true (T) or false (F)
1. In aquatic ecosystems, zooplankton are consumed by phytoplankton. 2. Zooplankton are heterotrophs. 3. Biomass is always highest at the lowest trophic level of a food web. 4. Most of the Earth's phosphorus is trapped in sedimentary rocks. 5. Assimilation is the process by which inorganic substances are incorporated into organic molecules.
In some cases, when an insect begins feeding on a leaf the plant responds by activating a signaling pathway that
results in the production of ____, which disrupt an insect's capacity to digest proteins
a. gibberellins b. lipases c. chitinases d. protease inhibitors e. cytokinins
Which method of transport is illustrated here?
a. potocytosis
b. pinocytosis
c. receptor-mediated endocytosis
d. phagocytosis