IP3 receptors are associated with
A) plasma membranes.
B) Golgi apparatus membranes.
C) mitochondrial membranes.
D) ER membranes.
E) endosome membranes.
Answer: D
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Which cells assist and nourish neurons that transmit electrical signals?
a. receptor cells b. neurons c. effector cells d. glial cells e. signal cells
In the following list, pick the one that is NOT a source of genetic variability from meiosis and
fertilization.
a. recombination of homologous chromosomes b. segregation of chromosomes c. genes contained in the gametes that fuse to form a zygote d. recombination between sister chromatids e. physical arrangement of chromosomes along the metaphase plate in preparation for anaphase
A variation in the pattern of nucleotides that often contributes to genetic anomalies is called a(n) ________.
A. short interspersed nuclear element B. genetic marker C. restriction enzyme D. DNA microarray
Which of the following statements best describes the history of life on Earth?
A) The Earth had multicellular life-forms for most of its history. B) The Earth had single-celled life-forms for most of its history. C) The Earth was lifeless far longer than it had living things. D) The Earth had photosynthetic organisms about 100 million years after it formed.