Which of the following is the approximate threshold value for mammalian neurons?
A. +35 mV
B. -55 mV
C. 0 mV
D. -80 mV
The approximate threshold value for mammalian neurons is -55mV.
Therefore, the Correct Answer is B.
More Questions on TEAS 7 Science
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Q #1: To separate genomic DNA fragments by size, which of these laboratory methods is most useful?
A. Filtration
B. Spectrophotometry
C. Titration
D. Electrophoresis
Answer Explanation
One of the most common techniques for separating DNA fragments by size is electrophoresis. Electrophoresis is a process that uses an electric field to move charged molecules through a porous gel matrix. The gel acts as a sieve, allowing smaller molecules to move faster and farther than larger ones. By applying a dye to the DNA samples and loading them into wells at one end of the gel, the DNA fragments can be visualized as bands after electrophoresis. The distance of each band from the well indicates the size of the corresponding DNA fragment.
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Q #2: Which of the following are used to determine a person's DNA sequence?
A. Enzymes
B. Blood types
C. Genes
D. Hormones
Answer Explanation
Genes are used in techniques like DNA sequencing to determine a person's DNA sequence. DNA sequencing involves determining the order of nucleotides (A, T, C, and G) in a DNA molecule. Genes are used to replicate and amplify DNA segments, allowing researchers to analyze the sequence of nucleotides present in a person's DNA
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Q #3: Which of the following is a mass within the ovary that secretes hormones to maintain the uterine lining during pregnancy?
A. Oviduct
B. Corpus luteum
C. Oocyte
D. Umbilical cord
Answer Explanation
Corpus luteum. The corpus luteum is a temporary structure that forms from the ruptured follicle after ovulation. It produces progesterone, which is a hormone that prepares the endometrium (the inner lining of the uterus) for implantation of a fertilized egg. If pregnancy occurs, the corpus luteum continues to secrete progesterone until the placenta takes over.
