A couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. They are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. Which hormones are they?
A. Follicle-stimulating hormone (FSH) and luteinizing hormone (LH)
B. Insulin and glucagon
C. Oxytocin and luteinizing hormone (LH)
D. Adrenocorticotropic hormone (ACTH) and corticotropin-releasing hormone (CRH)
Answer: A
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When the Bicoid protein is expressed in Drosophila, the embryo is still syncytial (divisions between cells are not yet fully developed). This information helps to explain which observation by Nüsslein-Volhard and Wieschaus?
A) mRNA from the egg is translated into the Bicoid protein. B) Bicoid protein diffuses throughout the embryo in a concentration gradient. C) Bicoid protein serves as a transcription regulator. D) Bicoid protein determines the dorsoventral axis of the embryo.
Industrial melanism is a term
A. describing the color change induced by living in industrialized areas. B. explaining that the darker moths have higher mutation rates because of industrialization. C. describing the evolutionary process in which initially light-colored organisms become dark as a result of natural selection. D. explaining that the darker moths having higher reproductive success because of their pigmentation. E. describing the widespread implementation of pollution controls.
The production of natural carbon dioxide by yeasts after a wine is bottled results in ________.
A. sweet wine B. brandy C. champagne D. dry wine
Human immunodeficiency virus causes a(n):
A. Latent infection B. Acute infection C. Unapparent infection D. Weak infection E. Chronic or slow infection