A and a are dominant and recessive alleles, respectively, of the same gene. Which genotype(s) would result in an individual with the recessive phenotype?
A) aa only B) Aa only C) AA only D) Aa and aa E) AA and aa
Answer: A
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A centromere is least likely to ____
a. divide in anaphase of mitosis b. connect sister chromatids c. attach chromosomes to spindle fibers d. cross over during prophase I of meiosis e. be a component of DNA
In agriculture, male animals are often castrated to modify their behavior and to produce desirable qualities in the meat. What would you predict about hormone levels in castrated male animals?
A. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low. B. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high. C. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low. D. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high.
When insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake, this is an example of
A. autocrine signaling. B. paracrine signaling. C. direct intercellular signaling. D. endocrine signaling. E. contact-dependent signaling.
The valence shell of hydrogen or helium is unstable when it contains two electrons.
Indicate whether the statement is true or false