Of the following, which is probably the most common route for membrane flow in the endomembrane system?
a. Golgi lysosome ER plasma membrane
b. tonoplast plasma membrane nuclear envelope smooth ER
c. nuclear envelope lysosome Golgi plasma membrane
d. rough ER vesicles Golgi plasma membrane
e. ER chloroplasts mitochondrion cell membrane
d. rough ER vesicles Golgi plasma membrane
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What is the difference between pollination and fertilization in flowering plants?
A) Fertilization precedes pollination. B) Pollen is formed within megasporangia so that male and female gametes are near each other. C) Pollination is the transfer of pollen from an anther to a stigma. Fertilization is the fusion of haploid nuclei. D) If fertilization occurs, pollination is unnecessary.
Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. orientation with respect to the Earth's magnetic field B. move to other bacteria and aggregate with them in response to chemical signals C. respond to light with the aid of flotation devices D. respond to other individual bacteria and transmit DNA via conjugation E. none of the other options presented
Which of the following chemicals has the LEAST influence on the regulation of breathing rate?
a. O2. b. CO2. c. H+. d. N2. e. CO.
Steroid hormones generally work by:
A) passing into the cell and attaching to receptors inside. B) attaching to membrane receptors and triggering chemical reactions. C) triggering an action potential in the cell. D) triggering an influx of potassium ions. E) stimulating endocytosis of hormones and receptors.